I had a bad experience with JKS discos and took them off. I have used other JKS parts that have been great.
I've considered the Rancho 5000x's. Both Fox and Eibach shocks could do a better job of absorbing sharp impacts on my 2dr JK but otherwise handle great on and off road. Metalcloak...
The Magnaflow 15115 JKU/15116 JK catback has a 4" resonator and a large but thin muffler in the stock location. It's still in the back so it can be hit/damaged, but it is thinner than some of the other aftermarket mufflers. Also, having the resonator and large muffler, it's quieter than others...