Although I like a lot of games on 360, I honestly think that when I buy a console (as soon as my car fund is complete) it might be the Wii.
Why "might"? Because while it seems like it has a lot of potential and right now is right up my alley, I've been burned with N64 (like 4 good games for it) and Gamecube (perhaps 3 good games).
I don't want to keep funding my eventual disappointment, so I'm really hesitant about Wii.
Some of my AIM/MSN friends feel the same way, and I assume there's more of us. That's why I don't think Wii will do that hot this generation, even though it has potential.
Actually, PS3 is starting to shape up, and in a year, it could be actually "considerable purchase" good. But I think 360 will win the war.