I'm definitely getting an XBox 360.
The only reason I would get a PlayStation is for the Final Fantasy games. And that series has been arse lately, all of the characters being crybaby feminine types. Plus the dude who made Chrono Trigger, and the series music composer Uematsu or whatever.. have split Square and formed their own company to do XBox RPG's. One called Blue Dragon is coming out, looks pretty sweet.
Other awesome games coming out for the 360: Mass Effect, Perfect Dark Zero, and of course Halo 3.