I've gone through that dilemma with my car a couple of times. How long have you owned your ZJ? My car ended up staying both times I thought about selling it because of two reasons. my grandmother gave me the car after My grandfather died; it was his car. I've also owned the car for 9 years and have a lot of blood, sweat, tears, and money into it which I'll never get back.
01 TJ - 4.0L, NV3550, 2" Skyjacker budget boost, Xenon flat flares, Trail Gear front bumper, Tuff Stuff rear bumper, RH4X4 sliders, 33" STT Pros on 15x8s