I have PS3 so I'm stuck with Vader. Not that that's bad, its just that Yoda is so much better. I heard somewhere that at sometime in the future they'll be releasing something that will let you get the two you didn't get. I don't know exactly how that would work, but I hope its true.
I have all the major consoles but I'm getting it for PS3 for Vader. If Grevious was actually an option I might go with that cuz it'd probably be pretty fun.
SO is this something that is actually happening or a hypothetical from a Star Wars fan? Anyway, I vote for Grievous like I always do. He came out lame in the movie but if you watched the Clone Wars cartoon (which I saw before the movie) he comes out about 500 times more badass. Half of his screen time is him just literally beating the shit out of no less than twelve people at once.