As said, lifting a ZJ is a serious business, I have had two ZJs so far. You have to ask yourself if you really want to lift this thing for show or to wheel the hell outta it.... For show, go with a complete RE 4.5", I have some contacts that can get it cheaper than 1300. You can also look at Rustys 4" lift, www.rustysoffroad.com
this lift has been reported to bring around 4.5" of actual lift. While the RE kit lifts more like 5.5". If you want to go hardcore with your ZJ then we are talking some serious money....you will need adjustable control arms to run over 5" of lift, or you could always go for long arms... check out www.rockkrawler.com
for one of the only long arm KITS on the market. Also the RockReady 8" lift kit is actually for the XJ Cherokee. PM me if you need anymore advice. Later on.