Now I know for some this is heresy, but that is why I'm posting in the 3D forum. I also think my two suggestions would not be financially viable so I know I'm just blowing bubbles, pretty bubbles in the air.
I'd like to see the original King Kong in 3D. I think it could be a fantastic experience. I'd also like to suggest Ray Harryhausen's Beast from 20,000 Fathoms. I can think of a couple of times where the beast walks right at and very close to the camera. It would be fun.
While I'm at it, Peter Jackson's King Kong would be great in 3D too. But that's three suggestions.
I'd rather see these in 3D than the untouched, virgin, OT of Star Wars. I'm sorry, I shouldn't have said that. The devil made me do it.