We have a couple of high end EIKI, and a few Epsons. The bulbs are $500 each, just to keep a spare. We actually have the "portable" models mounted to the ceiling and use the remote to focus, adjust and turn off. You probably want to figure out how bright you need your image for the size of room and conditions. The higher lumens output, the more cost. You probably want to get something to handle the higher resolutions, beyond XGA gets expensive. That way a laptop can look great when projected without interpolating the image. Of course, more expensive models can handle TV composite, s-vhs in.
Audio-video places would be glad to quote you or figure out what you need for your situation.
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www.bhphotovideo.com to see pro stuff)
We like to test ours out with an image of the batman logo and point it out the window...