Check out the epson powerlite or ex5210.
The powerlight ($600) is a little more expensive but will give you 720p HD (I'd go with this one).
Amazon.com: Epson EX5210 XGA 3LCD Business Projector, 2800 Lumens, HDMI, USB, 5.1 lbs: Electronics
The ex5210 ($500) is $100 less but also only gives you 1024x768 resolution. Don't mistake a projector having an HDMI input and thinking it's HD, that's often not the case.
Amazon.com: Epson PowerLite Home Cinema 705 HD 720p 3LCD Home Theater Projector: Electronics
Both projectors have RCA inputs on them which means you could connect a dvd player, cable box or most cameras/video cameras to the projector. I'd avoid going the used route. The bulb timer is easily reset and frequently inaccurate. Let me know if you have any other questions.
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