I like what Sean said above, and agree that it would be best to keep the Cherokee in its original stock condition without installing a suspension lift kit. Installing taller tires puts stress on the steering, suspension and driveline components over time which can result in serious downtime offroad or on the highway, eventually. I would only recommend lifting the rig if your offroad driving conditions require more ground clearance or greater approach, departure, and breakover angles.
Once you start changing the original design criteria, you create new unplanned weak-links in the driveline, steering, and suspension assemblies. One of the most obvious results to installing taller tires is the vehicle"s loss of performance acclerating from a stop and braking, for example. Of course, all and any negative results from any modification and be corrected with more modifications (as in more money). The Cherokee is a unibody type vehicle, and I would encourage you not to thrash this vehicle offroad unless you install a full frame under the rig. Have fun with your new vehicle. <img src="/forums/images/graemlins/cheers.gif" alt="" />