Buffy-- Ellen Page
Xander-- Chace Crawford(from Gossip Girl)
Willow-- Zooey Deschanel
Giles-- Tom Welling
Spike-- Chad Michael Murray

Buffy-Evan Rachel Wood (if she can deal with Mr.Manson she can handle vampires)
Xander-Adam Brody
Willow-Samaire Armstrong
Giles-Hugh Laurie
Spike-Ed Westwick (he is evil enough)

Buffy: Natalie Portman
Xander: Michael Cera
Willow: Kate Bosworth
Giles: Joseph Fiennes
Spike: James McAvoy

Angel: Hayden Christensen
Cordelia: Leighton Meester

Buffy(Scarlett Johannson)
Willow(Danielle Harris)
Xander(Adrian Grenier)
Giles(Daniel Day-Lewis)
Spike(Stephen Dorff)

I know at least one of these is going to be obvious, but...

Buffy - Hayden Panettiere
Willow - Kat Dennings
Xander - Shia Labeouf
Giles - David Thewlis
Spike - Tom Felton

i loved this show! i can't even think of anyone that can substitute for the real thing..
by the way - there's a rumor i heard for all you buffy fans - the WHOLE set of dvds (season 1 - to the end) is at costco for $100 bucks... thought i'd pass on the info!

Buffy Ellen Page
Xander Michael Cera
Willow Katherine Heigl
Giles Denzel Washington
Spike Ryan Philippe

Oh, my GOD, my favey favey show!! I miss Buffy so much, STILL. ;(

Buffy - Kristen Bell
Xander - Shia LeBeouf
Willow - Ellen Page
Giles - Hugh Laurie
Spike - James McAvoy

Extra Credit:
Angel - Emile Hirsch
Cordelia - Megan Fox
Anya - Amanda Bynes
Tara - Chloe Sevigny
Riley - Paul Walker
Dawn - Daveigh Chase

I think I use Hugh Laurie in, like, every recast!

Buffy--Michelle Ryan
Willow--Tina Majorino
Xander--Kyle Gallner
Giles--Jude Law
Spike--Jason Dohring

if it makes a difference i really like WiplashgirlChild's picks (coming from a hardcore buffy fan who really can't see anyone else but SMG being buffy!)

Buffy- Kristin Stewart
Xander- Penn Badgley
Willow- Amber Tamblyn
Giles- Paul Bettany
Spike- Kyle Schmid

*Kristen

Buffy Kristen Bell
Xander Zach Levi (Chuck on 'Chuck')
Willow Tina Majorino
Giles Charles Shaugnessey (Mr. Sheffield on The Nanny)
Spike Ed Westwick- (Gossip Girl- Chuck Bass)

Extras-

Cordelia- Rachel Bilson

Wesley- James Scott (All My Children, Days of Our Lives)

Buffy: Blake Lively
Xander:Zach Braff
Willow:Alexis Bledel
Giles: Simon Cowell
Spike: Jesse Spencer

Simon would be great. "Buffy, that was just dreadful. I really don't know why you're the chosen one."

Buffy: Britney Spears
Xander: Adnan Ghalib
Willow: Alli Simms
Giles: Sam Lufti
Spike: Kevin Federline

Love this show. Really can't see anyone else in these parts...but also can't resist a recast challenge. So here goes.

Buffy - Natalie Portman
Xander - Patrick Fugit
Willow - Jena Malone
Giles - Colin Firth
Spike - Cillian Murphy (he's got those cheekbones)

And for fun...

Dawn - Ellen Page
Anya - Anna Paquin
Cordelia - Rachel Bilson
Angel - Ryan Reynolds

Buffy - Kristen Bell
Xander - Ashton Kutcher
Willow - Rachel Bilson
Giles - Michael Weatherly (even those he's not British)
Spike - Seth Green

Buffy – Kristen Bell
Xander – Zachary Levi (Chuck)
Willow – Tina Majorino
Giles – Ewan McGreggor
Spike – Milo Ventimiglia

For funsies
Angel – Hayden Christensen
Cordeila – Leighton Meester (Gossip Girl)

this show can never be recast. seriously, i don't think this show is old enough to be recast. a lot of ppl are putting down actresses who are similar in age to smg, so it doesn't make a lot of sense.

btw, i LOVE that angel isn't included in the recast.

Buffy-Kristin Bell
Xander-John Krasinski
Willow-America Ferrera
Giles-Ricky Gervais
Spike-Zachary Quinto

Buffy-Hayden Panettiere
Xander-Michael Cera
Willow-Ellen Page
Giles-David Tennant
Spike-Jonathan Rhys Meyers

Buffy - Kristen Bell
Xander - Adam Brody
Willow - Ellen Page
Giles - Colin Firth
Spike - Jensen Ackles

Cordelia - Sophia Bush
Angel - Milo Ventimiglia
Dawn - Hayden Panettiere
Anya - Jena Malone

Here goes…

Buffy (Monica Keena)
Xander (Nick Stahl)
Willow (Mila Kunis)
Giles (Lance Henkriksen)
Spike (Karl Urban)

Angel (James Franco)
Cordelia (Megan Fox)
Anya (Kelly Carlson)

That is... Lance Henriksen*, as Giles.

I see some people had some of the same ideas as me.

Buffy - Hayden Panettiere
Xander - James Marsden (a little older but definitely the Xander vibe from him)
Willow - Krysten Ritter (Gia from S2 of VM)
Giles - John Barrowman (Jack Harknesss, Torchwood)
Spike - Ed Westwicke

for extra credit ...
Dawn - Willa Holland (Kaitlin, The OC)
Cordelia - Rachel Bilson
Angel - Jason Dohring

It's tough to imagine the show being cast with other actors and actresses. The original cast is perfect IMHO, especially Sarah Michelle Gellar.

Buffy - Amber Tamblyn ("Joan Of Arcadia") - one of the most talented young actresses right now

Xander - Jesse Bradford ("Bring It On") or Shia LaBeouf (Jesse probably is a little bit too old if you'd cast him now)- both are kinda geeky, yet handsome and charming

Willow - Kristen Stewart ("Speak") - she looks not only sweet, but also smart and is very gifted as an actress. A girl who's pretty tough to hate.

Giles - Victor Garber ("Alias") - originally I wanted to go with Johnny Lee Miller, but he's too young. Victor on the hand has everything a good father figure needs. He proved that on "Alias".

Spike - Ryan Gosling ("Stay") - talented and handsome.

Angel - Eric Dane ("Grey's Anatomy") - not a good actor, but at least he'd be handsome and mysterious enough

Cordelia - Caroline Dhavernas ("Wonderfalls") - pretty, likeable, but can play "b*tchy" just as well as nice

Anya - Becki Newton ("Ugly Betty") - I think she has a comedic timing that is just as good as Emma Caulfield's.

Tara - Jayma Mays ("Ugly Betty", "Heroes") or Majandra Delfino ("Roswell") - very likeable and shy.

Oz - Eric Lively ("Speak") - handsome.

Alright, this is a little perverse but...

Buffy - Sara Foster

Willow - Jill Ritchie

Xander - Jordana Brewster

Giles - Susan Sarandon

Spike - Scarlet Johansson

Angel - Danny (from Tia Tequila)

Cordelia - Meagan Good

Dawn - Hayden Panettiere

Tara - Michelle Trachtenberg

Anya - Ashley Tisdale

Buffy - Kristin Bell
Xander - Matthew Gray Gubler (Criminal Minds)
Willow - Jenna Fischer (The Office)
Giles - David Duchovny
Spike - Cillian Murphy

Anya - Liza Weil (Gilmore Girls)
Tara - Chloe Sevigny
Andrew - Michael Cera
Warren - Joseph Gordon-Levitt
Jonathan - Emile Hirsch
Drusilla - Helena Bonham Carter

Buffy- Hayden Panettiere
Willow- Jena Malone
Xander- Zac Efron
Giles- Sacha Baron Cohen
Spike- Jonathan Rhys Meyers

Oh this is a hard one. I can't picture any one other than SMG to be Buffy. I love this show.

Buffy - Elisha Cuthbert

Xander - Adam Brody

Willow - Lacey Chabert

Giles - Matthew Broderick

Spike - Wentworth Miller

Buffy - Taylor Momsen
Willow - Tina Majorino
Xander - Michael Cera
Giles - Gary Oldman
Spike - Jonathan Rhys-Meyers

Buffy: Kristen Bell ("Heroes")
Giles: Victor Garber ("Alias")
Willow: Ellen Page ("Juno")
Xander: James Franco ("Annapolis")
Spike: Jonathan Rhees Meyer ("The Tudors")

Cordelia: Leighton Meister ("Gossip Girl")
Angel: Dave Annable ("Brothers and Sisters")
Anya: Zooey Deschanel ("Tin Man")
Dawn: Anna Sophia Robb ("Bridge to Terabithia")

I am concerned with all the hot Giles. This could cause a few problems...

Buffy: Hayden Pantierre (heroes)
Willow: Alexis Bledel (gilmore girls)
Xander: Josh Radnor (how I met your mother)
Spike: Johnny Depp
Giles: Steve Coogan

Buffy (Scarlett Johansson)
Xander (Gordon Joseph Levitt)
Willow (Melanie Lynskey)
Giles (Gabriel Byrne)
Spike (Heath Ledger)

Buffy - Kristen Bell
Willow - Ellen Page
Xander - Penn Badgley
Giles - Michael Caine
Spike - Milo Ventimiglia

This was a fun one! I had quite a few choices for some of the characters. Here are the best ones I came up with:

Buffy-Hayden Panettiere (Sometimes the obvious choice is the best one.)
Willow-Ellen Page
Xander-Penn Badgley
Giles-Christopher Walken (Don't even try to tell me he wouldn't make an amazing Giles!)
Spike-James Franco

Extras:
Cordelia-Leighton Meester
Angel-Jared Leto
Dawn-Emma Watson
Anya-Brittany Snow

Buffy - Alona Tal (Meg on VM, Jo on Supernatural) Similar body type to SMG, she's blonde, and she was in the Israeli army, so you know she could fight.
Xander - Zach Gilford (Saracen on Friday Night Lights) He has the fumbling stumbling attitude down pat as evidenced in nearly every episode of FNL
Willow - Emma Watson (Hermione on HP) Hermione and Willow are very similar, so you know she can play the brainy girl, and she's got the looks to pull of the sexy Willow of the later years
Giles - Paul Blackthorne (Harry Dresden on The Dresden Files) British, authoratative, and he's been in genre shows before.
Spike - Jonathan Rhys Meyers (Bend It Like Beckham) He has the lithe physique, and the ability to convey the smoldering danger that always emanated from Spike

Buffy: Kristen Bell (Veronica Mars)
Xander: Zachary Levi (Chuck)
Willow: Alexandra Holden (How to Deal)
Giles: Kenneth Branaugh (Harry Potter and the Chamber of Secrets)
Spike: Paul Bettany (A Beautiful Mind)

And two extras . . .
Angel: Jonathan Rhys Meyers (The Tudors) (who, like Angel, is actually Irish)
Cordelia: Linda Cardellini (Freaks and Geeks) (to be the opposite of her old character Lindsay Wier)

Buffy - Kristen Bell
Xander - Adam Brody
Willow - Zooey Deschanel
Giles - Bradley Whitford
Spike - Jonathan Rhys Meyers

I think Kristen would make a great Buffy (though of course noone can replace SMG/P in my heart!) she's a fantastic comedy actress, and Buffy had some great one-liners, and as Veronica Mars she was pretty much a Buffy-type character with less vampires!

Buffy-Hayden Panettiere
Xander-Adam Brody or Penn Badgley (i really dont want 2 cast members from gossip girl in, it but Penn is just sooo cute)
Willow-Ellen Page
Giles-Hugh Laurie
Spike-Ed Westwick

Ok this is going to be crazy but...

Buffy - Kristen Bell
Xander - Seth Rogan
Willow - Anna Faris
Giles - Daniel Craig
Spike - Emile Hirsch