Can't decide which game to buy. Would like advice.

[Tokoro]

I don't know if you've played GBA games  (probably have), but if not, The Legend Of Zelda: Minish Cap is a very good experience. There are tons of others too, but that's pretty big one. Edit: oh, and the original WarioWare, that was really fun too^^; (like I said, sorry if you've played these already)

for the DS I heard The World Ends With You is really good, and there's quite a bit of stuff for that.

The Wii I'm not too sure^^; I haven't gotten new games in a while, but maybe if you have people to take turns with,
WarioWare: Smooth Moves might be good.

I don't own a PS3 so sorry^^;