I probably should have mentioned that I originally bought my HP (from AVS I think) when I got my 2nd projector, the NEC LT85 (800x600 version of the popular-at-the-time LT150). That was in when I lived at the house I owned two houses ago. I had the projector mounted (essentially a back wall mount) just about 1.5-2 feet above my head (when seated). I then upgraded to the Panasonic AE-700U, and had the projector in the same position. Then I moved, and moved again, and in my current house the only room that would work as a dedicated movie room is my upstairs loft, which has terrible acoustics, wall/ceiling angles, open areas, skylights, and is painted white. At my last house I bought six home theater chairs which I brought with me to this house, and it would have been akward to floor-mount the projector in front of my front seats, plus the ceiling is so high here (I forget, but probably about 10') that it made obvious sense to ceiling mount the projector. Despite the high ceiling, I did buy a mount with a long extension, so it's probably only about 8' up. A case could have been made that the projector position and my existing screen didn't mate well, but the screen fit well for the spot, so I played it cheap and didn't think to change that. Now I'm thinking about going 3D (and 1080p), but I'd like to keep my existing screen for now, and possibly upgrade that later. So, a couple of questions:
1) Even with the sub-opimal positioning, aren't I getting > 1.0 screen gain?
2) Assuming I were to paint my walls/ceiling dark and control most light (or watch only at night), if I want to watch 3D and have it be bright enough to overcome whatever loss I'd get when using the shutter glasses, what's the ideal screen to pair with a ceiling-mounted HD33/3300?