If you can squeeze out the extra $100, get the version with the 80 gig drive instead of the 40 gig. Only the 80 gig has the backwards compatibility to play PS2 games.
Of course, that may not be important to you, but all I can say is
"Ratchet and Clank Rules!"
Edit: Gocart is right.... Asteroids for the Atari is the best game ever. Either that or Pong
