Get yourself a 95 or newer XJ front end, chop the factory 4 link crap off and weld some spring perches on it. These are the best Jeep axles to use because of the bigger u-joint size and no CAD (center axle disconnect). My rig is set up for coils so I cant help you much beyond that. If I had my rig set up for leafs, it would definately be running some sort of Yota front spring. Whether it be All-Pro, Marlin, or Trail Gear, I've seen the springs in action and they work very well. They are all good products at a good price. Normally they also have a few different spring rates to choose from too.
