Don't forget about the other great reasons for a PS3 Roto.

Tekkan, Wild Arms 5, And even though I believe Virtua Fighter 5 is also going to be on 360 (Don't remember where I heard this) I'd rather have it for ps3 when I get one, simply because the Graphics will most likely look better. And of Course Makai Wars.

Still plenty of stuff to get a PS3 for.