OK I'll add my 2c here.
R34 first, R33 second, and R32 sitting last.
Why?
R34 GTR - need I say more?
R33 GTR - Lowered with a decent set of wheels they look horny. Newer than R32, more comfortable (remember that they *are* road cars). More spacious and slightly larger, but weighs stuff all more than an R32. Some are getting a bit on the oldish side but the later models are still fairly fresh. IMO far better looking than an R32 as well.
R32 GTR - The legend, but they're getting old and the shape has aged - gracefully (they do look tough, just like any GTR), but they have, nonetheless, aged. Also long in the tooth generally means the car will be more worn, and from an ownership point of view (rather than a "damn that's a nice car" viewpoint), that can be bad news. And, personal preference, I much prefer the look of the R33 and especially R34, they're more modern.
No doubt the 32 guys disagree but I don't give a stuff