I had a 90ish that was saggy. I took it to a spring shop and had them re-arc the rear 1 1/2" over stock. You might consider just throwing a new set of springs on all around. They are probably pretty tired. Or on the cheap you can put on a 2" lift helper spring $80.
I'm happy with the power, mileage and all with my 13 JKUR. I hated the factory wheels... Looked like they are off a Subaru or 79ish firebird. Not sure why Jeep went away from the Moabs for these goofy looking things.
I have Toyo AT in 285/75r17... They were really good but totally suck on ice and snow. When I ran smaller tires, I usually went Bridgestone Revo... They were great in all the conditions I hit. My company trucks all run the Cooper M&S in the winter and I've had good luck with them.