We lift a lot of jeeps and I own one myself. I hate body lifts and with that being said here is my advice. 97 to 2006 TJ models ride and work real well with a lift. Your factory springs are most likely getting weak and not to OEM height anymore. So 4 new springs and shocks will do the job nicely. 3 to 4 inches will give you the best bang for your buck. Going over 4 inches will cost a lot more and you make a lot of durability and reliability compromises. I like BDS and Zone lifts. So 3 to 4 inch lift. Get a slip yoke eliminator and a cv rear shaft. That way the skid plate will stay stock height and you wont have to modify the 4wd linkage or have stiff shifting if a manual due to shift boot interference.