i was thinking, if KARA and SNSD did something...it'd be 14 girls on a single stage, lol...well, i guess since snsd has so many members, anytime special stage would be packed...
but, yea, i think that would be cool, their images fit each other well...both the cute girl-next-door image...
for guys, Big Bang would be pretty cool (and i hear there may be one?), but i agree that SHINee would prolly fit best...image-wise...