Make sure you want a 4cyl. Would be my first advice. Next would be your list of criteria, ie; axles, full doors, half doors, hard top, soft top, a/c, manual, auto, low mileage, etc. When you find one that meets an acceptable amount of criteria I suggest you pick it apart and honestly look at its condition and what it needs. Just my $.02, I found a pretty sweet little TJ but I compromised on the axles and a hard top. That was acceptable to me, because of the vehicles condition and other features.
Good luck and may you find what you seek!