Quantify whether you have the ability to do a rear projection system.

If you can do a rear projection system anything above 2000 lumens will work. Provided the space behind the projector is enclosed and ambient light can be controlled in that enclosure.

What to look for in a projector:

Minimum Lumens: Rear projection (2000)

Front projection (4500)

Contrast Ratio: >1000

Bulb: Arch type Bulb (not filament)

Minimum Bulb life: 2000 hours

Aspect Ratio: Both 4:3 and 16:9 (widescreen)

Resolution: 1280 x 720 (HD) other wise know as 720p (progressive)

1920 x 1080        other wise know as 1080i (interlaced)

If you can, try to find a projector that has sealed optics.

Panasonic has some new models that are liquid cooled and have sealed optics.

PT-D5500U

PT-DW7000U

PT-DW7700U