We can talk all day long about lift kits on this thread...but here's the real info from a guy that doesn't have a "dog in this fight" since I don't own a TJ, and don't have anything to prove about how much I know about TJ suspension. If you want to lift your Jeep, here's what you should do:
#1. Decide what you want to do with your Jeep. Daily driver that sees an occasional trail, but nothing serious? Daily driven rig thats sees plenty of trails and you want to push your limits a bit? A road-legal rig that is heavily modified for SERIOUS off-road? A Jeep that you can no longer drive on the road, but makes people poop themselves when they watch you off-road?
#2. Go on a BUNCH of open runs, and come to sonme club meetings. Jeepers all have the same disease - we're compulsive when it comes to talking about our rigs. We'll all spout off for hours on end if you let us. Mine us for information that is useful for YOU...not what a random web wheeler wants to tell you. Qualify the information that you're getting from people by watching how their rigs perform.
#3. Eventually, one of two things will happen. Either you will find someone who's rig is EXACTLY what you want, and you can mimic their setup...or all of the information coming your way will start to sort itself out and line up in your head, and you'll be able to build a coherent plan for turning your Jeep into what you want it to be. Don't expect either of these things to happen until you've spent six months saving your money and gathering information. Even if you wait twelve months, it won't do you any harm.
#4. Remember when I mentioned saving your money? That's where this comes in. Do it right, do it once. Spend some money on quality components that work, and will continue to work. Don't buy some crapola kit that has cam bolts instead of adjustable control arms, cheap bushings instead of quality joints, and "relocation brackets" instead of longer brake lines. Once you've spent the time getting the knowledge, don't be afraid to do a little bit of mixing and matching.
The people that I know who spent the time, did the research, and bought high quality components all seem very happy with their rigs. It didn't happen overnight, but they also don't spend time on the trail cursing at their suspension, and don't seem to continuously be spending money on repairing suspension parts.
They are able to spend their money repairing other parts