GameCube
I got the GameCube - mainly to play Rouge Leader II. I've had it since Christmas and still love playing that game.
I'm borrowing an XBox from a friend right now and am less than impressed considering it's "superior" hardware to the PS2 and GameCube. I've only got 3 games though, so I may not be seeing the best it has to offer:
* Halo - pretty cool but needs a keyboard/mouse,
* Gotham Racing - Pretty, but not that much better than Metropolis Street Racer on Dreamcast (it's prequel) and
*NFL Fever 2002 which looks nice but I'm not much of a video-football fan unless it's NFL Blitz!
I've also played Dead or Alive 3 at the store and didn't think it was a huge leap from DOA 2 on the Dreamcast either - graphics are marginally better but the gameplay was clunky feeling for some reason. (Maybe I'm just not used to the XBox controler) It definately wasn't so much better than the DC DOA 2 that I would be willing to pay $50 for it (not to mention the cost of the XBox)
I'll probably pick up a used PS2, mainly to play Gran Turismo 3 (the prior two games being about the only thing I played on my PS1) unless someone releases a comperable racing game on the GameCube.
My Dreamcast still serves up a great fight with DOA 2 and Soul Caliber too (can't wait 'till Soul Caliber 2 on GC comes out though!)
-Eric S.
PS: Super Smash Bro's does not suck - especially if you have multi-players all going at it! Luigi is good game too, but too short.