96 was an good year for them, but they are very rare, even as far as 3/s cars go( any of those are rare period, not to mention the 96's) but a good choice. 91 there's alot of controversy over their egines, and souping them up, but ive seen some sweet 91's tho, so... just controversial. but theirs plenty of 91's (again as far as 3/s's are concerned... their all still rare cars!) 93 was a good year, i have yet to hear bad stuff bout them. i believe they have the 4 bolt that the 91's lacked. 93's good. in conclusion, if i had my choice, it'd be a 99 VR-4 !!!!! aaahhh.... so beautiful !!!! lol but, then again, ppl in hell want ice water... lol (translation, i cant have one[yet!!]) so in ur sit. id prolly get the 96 if i could, but a 93 would be badass as well, and since it would prolly be cheaper than the 96 i might get it instead... but their both harder to find then a 91, so i might just end up paying less than both of them and getting a 91... and if its a bit deal put a 2nd gen motor... bassicaly i have in no way answered ur question for u!
but... its stuff to think on!