I have the Teraflex 2.5 inch coil lift and am very happy with it. Attached are one pic about a week old empty and a second after the front bumper, winch and a weeks worth of heavy stuff in the back loaded in. Like any coil it is going to sag some when loaded up heavy. The good news for me is the 35s don't rub even with max load and the rig returns to a good height after the expedition is done and the gear unloaded (pic 3).
My LoD front bumper is about 90 lbs and the winch 60. I've provided the pics to give you an idea of what the 2.5 inch Teraflex coil springs gave me in height and the changes under three types of load. I would follow the advice in post 2 above. Your stock springs will sag more.
2012 JK Sport, auto, 3.73, Eaton E-Lockers, 3.5 inch AEV lift, Method 17x8.5 Standards, BFG AT LT31570R17s, LOD full width bumpers, SB RC-8 winch, sPod, Yakima Megabasket rack, BBL lightbar.