My ideal 'fixed' stock would be one based off the A5 RE, which uses the Magpul back plates, adapted to the McMillan/Packmayer (not sure on the original origin) LOP spacers. It would probably involve a floating adapter to go from the spacers to the MagPul contour, but the flexibility of something like that would have me consider a fixed stock. I realize the downside is weight, so this probably doesn't work.
Anything getting close to the A1 length makes the MOE Fixed and Sully stock comparably attractive options.

