(Assuming you are reffering t a ZJ and not WJ) I know the RE 3.5 kit is a good one, and IIRC it is priced accordingly. I did the F=>R swap (put the front springs in the rear and get some 4-4.5" coils up front.), which gave me 4.5 inches of lift. Of course then, you need to get a long arm kit to really get the performance out of the lift. Mine was on short arms and did fairly well. If you have the money, I would try to get a long arm kit, but they are quite expensive and require fabrication.