i just brought a great projector from http://www.powersellernyc.com for 2 weeks now at a great low price. its a BenQ PE8700 DLP Projector and it works great. the only problem i have is i don't know how to hook it up to the computer.
That's a great 720p projector with good reviews: http://www.projectorcentral.com/benq_pe8700.htm If your video card has DVI output then that's the one I'd use.