I'm also a side sleeper, with occasional arthritic bouts in both hip and shoulder as I've gotten older. I've never been able to use a closed cell pad (either Z-light or Ridgerest). I used a standard Thermarest (probably the equivalent of the Prolite 3?) for years, but eventually it stopped working for me. I then got a 2" thick Thermarest LE (about 1 1/2 lbs.), but after a couple of years it wasn't enough, either.
I now use a POE Insulmat Max Thermo (now the Ether Thermo), an insulated air mattress. The 48" length weighs 16.9 oz. I have found that this pad works really well when pumped up about halfway--keeps my hip off the ground but otherwise feels soft and cushiony yet supportive. It's also less slippery when only partially full of air. (Sleeping on a fully pumped up air mattress is like sleeping on a batch of metal cylinders, IMHO.) The top surface isn't slippery, but I've had to put some SilNet drops on the bottom to hold it steady on my tent's silnylon floor. However, it has been much more stable for me than was the Thermarest LE (which had a tendency to pop out from under me every time I turned over). For me, the POE air mattress is more comfortable than the mattress on my bed at home!
I haven't tried the BA insulated air pad. However, I have tried the BA Clearview. The shortest length (a foot longer than I need, because I'm short and sleep curled up) was 11.7 ounces on my scale (advertised at 11). Even adding another ounce with a 1/8" Gossamer Gear Thinlight pad (cut to torso length) for insulation, it was lighter than my POE pad or the regular BA insulated pad. It also has a slightly sticky surface--no slipping! However, I found that with 8 tubes instead of the POE's 6, the BA mattress when blown up is effectively thinner. I could not achieve a happy medium between having my hip on the ground or having the pad so hard that it was uncomfortable, not just to my hip but all over. I do have quite ample (!) hips, so this may not be an issue for more slender folk.
I suspect that there will be a lot of "bodies" lying on the floor at REI or other gear stores trying out the NeoAir when it comes out in April. It certainly is significantly lighter than other air pads, but I'm going to reserve judgment until I try it. If it isn't at least as comfortable for me as my POE pad--well, at least I'll save a considerable wad of cash.
Whatever you buy, spend a couple of nights on the floor at home with it before you take it out on a trip, so you can take it back if it doesn't work. I've slept on a lot of campsites (especially here in the NW where we are required to use established sites) that were just as hard as any floor.
To me, a restful night's sleep is worth however many extra ounces I have to carry to achieve it. I figure I can always cut weight elsewhere.