360.
i never really liked the xbox consoles (or 'x' marketing either), but, i've accepted that the 360 will have better games coming out for it, why? because it already has a huge fanbase, good games, and it's easy to develop for, if it's easier, that means cheaper which means more games will come out for it, it's very hard to port something good on the 360 or ps3 to the wii and do it well. Besides, it already has some of the best games released for it.
The wii, well, yeah, its cheap, and it has VC, which is cool, and so is the unique controller. However, very few games that can utilize this style (to the point that nintendo claimed it could do) or will. It's too gimicky and it's really all it and its games have going for it. It reminds me of a glorified version of those plug-and-play games that have a plastic bat and a home base...
the ps3, it's too buggy, too expensive. But if you're just a sony fanboy, or just want the latest MGS, Final Fantasy, or Resident Evil, or if you just want a blu-ray drive way before it becomes popular (and cheaper) and a more common medium, then go for it.
Of course, any choice will be swayed by the types of games you like to play. Personally, i like FPS games, and many good ones for the 360 have already come out.