I'll be getting the PS2, would have had it already if I could have exported it from Japan.
The reasons? Because Sony has good developers working for them that are enthusiastic about their jobs rather then only making money and other then things like Tomb Raider, they don't constantly repeat the same old titles over and over and over again.
I won't go near an Xbox because I think microsoft should be burned off the face of the planet, and I don't give a damn about what tech info it has, its just an undersized glorified PC with no monitor to me.
As for the Gamecube. Nintendo is INCOMPETENT as far as I'm concerned. They've gotten too far up on their high horse and can't make a quality game to save their hides anymore. I can count the good games for N64 on one hand, and Zelda is not one of them, nor is that DK junk. They haven't released something truely new in a long time, its always Mario, or Zelda, or Metroid (which they're bringing back for the GC), and castlevania which they killed on the N64.

I don't care about technical stats or who has more ram or a better cpu or whatever. I want a game that I can spend 40 or 50 hours on and say to myself after I beat it "That was fun."
I haven't heard of any big developers going back to nintendo, Square isn't and they make the best rpg's on the market for consoles IMHO.
I also like variety, which the N64 never had to speak of. No sports, fighting, or RPG's to speak of and none that were any good. Where as PS has piles of them.
If Nintendo can ever get back the former glory they had with the SuperNES in their quality and enjoyment factor then I might consider a Gamecube way off down the line, but for now its just an ugly box with holes in it to me.
All I can say about the Dreamcast is, wow, Sega did something right for once. I don't care for the system all that much (not enough good games right now) its at least respectable and a great improvement from the genesis/32X/saturn days when they really couldn't get their act together long enough to turn on a power switch. I don't think the DC will last that long in the face of the systems coming out, but at least they did a decent job with it this time around.
Final opinion:
Xbox - looks good at the target range
DC - Good try, has staying power, but we'll see
PS2 - Great system, good second and third party developers, huge opening selection of games (they have all the original PS games on top of its own)
Gamecube - Could be good if they make something original for it rather then the same old titles and charactors, some good second party developers would be nice too other than Rare. Till it proves itself though in rl, wheres the flush handle?