[Gluk Schmuck]

Halo is coming to the PC.

If you want an Xbox, buy one. If you'd prefer to play Ico or Rez, buy a PS2. If you want Super Mario Sunshine, Zelda GC, Super Monkey Ball, Super Metroid, Luigi's Mansion and Pikmin, *drools* buy a GameCube.
There aren't many great exclusives but there are some like Jet Set Radio Future. To come: Blinx, Fable, et al.

Personally, if I could only have one next-generation console, (but I can have more! Haha) I'd probably want a GameCube.

Edit: I don't know much about Microsoft's future plans for the Xbox (apart from Xbox Live) but I know Nintendo are planning to keep the GameCube for a long time before they replace it with a new console and concentrate on the games (good lard, have you seen the games? *drools*).