it all depends on what you want to do. definitely get the 4.0L like amerijeep said. i love my little 4 banger, but i wish it had more umph. the yj's are gonna be a bit easier to modify, but the tj has a better ride(coil springs). so i'd start with knowing what you want to do with your wrangler and go from there. if all you wanna do is plow and tool around in the summer, then a yj is probly a great choice. although once you get one, the fever(or sickness) will take over!!