I've got a late P reg 16v (feb '97) 5 doors with air con, bigger brakes etc.
Like you say later the better, i find the 5 door's are much more practical, especially if you'll have any passengers or loading stuff up in the back with the seats down.
I haven't seen many R reg 16v's, mostly 8's.
When i was looking there was a few jokers passing an 8v off as a 16v, as already been said, can't mistake the 2 really.