Never ran rear up front but I did run a calmini 5" SR kit and have switched over to YJ's. Without even being able to drive it yet I can say it is much softer and has a ton more flex. Trail Tough is a good place for a YJ kit and can sell you everything you need.
I run the Trail tough YJ kit and like it a lot but I do recommend a traction bar in the rear because the springs are soft and axle rap happens at the wrong times.I run 6 in the rear and five up front,I also run wider axles too.