A few things come to mind.
If you go for one of the earlier cars make sure it has had the steering lock replaced as part of the recent recall.
Later cars (2010 on) have a much better sat nav system (connect premium)
Check that the corners of the bonnet near the windscreen do not catch the wings. I have seen numerous cars with this issue easy fix to just lube the hinges, its a unnecessarily complex hinge that if not regularly used or lubricated can cause damage to the paint
Some cars on here have had gear box issues so make sure nothing feels or sounds odd with the gear changes
Nismos will have a completely different setup, handling is considerably different from the standard car.
Good luck with the hunt