Hi Motorhead75,
Hate to sound discouraging but if you don't have any experience with turbo cars , buying a GTR32 isn't such a good idea. Bearing in mind the GTR32s are as old as 15 years old, and a lot ot stuff will get broken or fail if they weren't replaced before.
For instance, the turbos; being ceremic they will most probably go off on you if it weren't replaced before, especially since it the R32s , which is known to be the most fragile out of all the GTR range.
Due to the ernomous grip the 4wd system has, the clutch would most probably be slipping by now.
The syncros of the gearbox would most probably needs to be looked at as it tends to wear due to its age. The gearbox casing tend to leak by this time too
I bet the oil sump would experiencing some leakage at this age ( heeheehee)
The radiator ( if its a standard ) which hasn't been replaced is a timebomb waiting to blow at the most unconvenient time !!!LOLOLOL
Dude..do I need to go on?heehehehe
Anyway, out of the cars you mentioned, I would go for the S2000..its the easiest to maintain , will surely be a classic like the S800 in the the future and of course...its a HUNNDAHHHH!!!!!!