I would have to say just from what i have seen, if you want a jeep with mostly stock stuff to keep you happy, get a newer one, the insides (and this is just my opinion) look to be a lot more difficult to monkey around with. I have a 90 and hell i have no qualms about drilling here, putting stuff there... and not worrying about the appearance, i guess the more holes the nicer it looks
where as i think the newer ones have the tendancy to look like "car" interiors, hell even some of those i wouldnt even want to take the top off if i were to own one just due to the fact that just would get all over the nice interior!!!
so you have to see what you want to do with it, if you want to monkey i would say maybe 92 and below. If you like as is go above.
Disclaimer* im sure many have modified thier newer models, its just my hummble opinion stated above.