I have the HP with a 60x80, the projector is under the seating off the floor 7" or so, and appx 10' from the screen. Looks great, but if I stand up or move off to the side a visible drop in gain is noticed. I used to mount the PJ on the floor and just raising it 7" made a great difference. You want the projector with a HP as close to your eye level as possible.
The HP reflects light back to the projector for 2.8 gain at that point. If you can set up your area to allow for that, its great. Most can not, and Huey's 1.5 gain screen suggestion will give the same result with a wider viewing area and cheaper price.
If possible try just painting a screen, I found a smaller painted screen masked in black, looks as good as my HP, and offers consistant viewing at all angles.
Test Your Display,
Tips for Large Monitor Use:
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