Same situation as Jim. As I've gotten older, my hips have gotten more sensitive. Over the years, I've gone through a progression of pads, from none at all, to blue foam, to old-style Thermarest, to Thermarest LE (2" thick and almost 2 lbs.), to POE Insulmat Max Thermo (2.5" thick and 17 oz.), and now a 20" x 60" x 3.5" thick insulated air pad from Kooka Bay. The last, by the way, in mummy style, weighs only 12.8 oz., proving that you can get comfort and warmth without paying a weight penalty.
Some folks like the NeoAir, but I never was able to get comfortable on the horizontal baffles, and I started shivering at 40*F. The NeoAir is also expensive. My custom Kooka Bay pad was about the same price!