First you'll probably want something mild...a 3-4.5" lift and 33s most likely, then the day will come when you have to get out the sawzall and make the first cut on your jeep, this will be scary at first but will soon become addictive. Eventually your cherokee will be an almost unrecognizable pile of parts that is barely safe or legal enough to drive on the street and you will grow to hate it most of the time. You'll miss having doors and a roof over your whole jeep and things like am fm radio and being able to drive highway speeds and long distances. Once you have your second or third, or eight jeep, you'll tell yourself that "this one will be different" and that "im going to keep this one nice" and it will be a real struggle to stick to that. That's pretty much how owning cherokees goes...for me anyways
Seth