I voted for Xbox360, funny thing, I dont actually own one yet, but I'm planning on getting one soon. The main reason I picked that is because of the Games that are exclusive to it, and the more... casual gaming aspect to it. Personally I play video games a lot, but I've had ps2,and ps1 since I was a kid, and the new ps3 feels more like you have to play and do it perfectly to unlock stuff rather than play for fun.
But thats just me.
Oh, also I was torn between the computer too because I've had some good times playing Left 4 Dead and WoW, but it just doesnt appeal to me all that much anymore, I detoxed from wow and focus on consoles now