Any more than a 1.25 body lift and you start to have stuff not fitting right. Then there's a visible gap between body and frame. if you did that plus some 2" coil spacers you are at your best bang for your buck right there. As mine is a yj it has leaf springs front and back where the tj has coils. You might want to google search for tj death wobble. I hear this is an issue on lifted tjs. Not applicable on the yj because of the leafs.

Personally i prefer the leaf spring suspension over the coils. I was never big on the minivan interior on the tjs either. But the only real good years of the yj are the 92-95 because they got the fuel injection, upgraded transmission and better roll bar.