BNjeepsta pretty much summed it up.
I think a 3" OME lift on 32s or 33s would be a good balance.
I wheeled a 99 XJ for years. I started with 2" ome springs and 31s, then soon moved to a 4.5" lift, 33s and 4.56. It did well on the trail at 4.5", but I wouldn't want to drive it cross country...