I don't think I would want Vader in the suit jumping around like the PT Jedi. It just would look weird to see someone in a big bulky suit jumping around like that. It looks good with characters in the loose flowing robes and clothes that the PT characters wear, but I just don't see it working with something like what OT Vader wears.
At a minimum, I wish that David Prowse had been better with a sword, or at least have a proper choreographer. Watching the OT now is just painful when you see Vader with his lightsaber. For someone who is established as one of the best (if not the best) Lightsaber wielders of all time, he is awful pedestrian with it versus Luke. Holding it with one hand, swinging it around, THROWING it???