Try the Nemo Zor Short. Mine came in at 9oz for 48" - lighter than the Prolite, and warmer, per BPL testing. I've liked mine so far, with no problems at all. It packs up quicker and inflates quicker too (probably because of the way it's cored).
The NeoAir was heavier, more expensive, noisier, harder to blow up, and uncomfortable due to the 2.5" drop-off at the arms (too narrow). The NeoAir short isn't even an option, it's 48" length and 2.5" leg drop-off is uncomfortable for most people, including myself. Also, the convection issue (every time you move) makes it colder than it's R-rating.
Add a GG sitlight or similar for the legs, to the Nemo Zor Short and you have full-length coverage for less than the weight of a NeoAir regular, without the hassle.