I use a Emagin Z800, a bit better than the VR920 but significantly pricier. The screens do 800x600 and the FoV is better.
However I don't think you can beat the VR920s bang for buck. Especially if you're new to VR. I've heard the VR920 scales stuff well to 800x600 and 1024x768.
I use the trackir emulator for AH and it works extremely well. You cannot get head movement along axis though (ie just look around not move around), but in my case I mapped lean left/right to the rocker on my X45 throttle and it works well. It supports saved views but I don't like the way your head moves to those.
Headtracking + stereoscopic 3d views makes a huge difference to AH, it goes from being a flat game to being much much more immersive.