Portable Presentation Projectors

I am a teacher, and I need to get a projector for my classroom.  I alternate between a Windows 7 and an older MAC, so it has to work with both.  I also need to move it around a lot - often carrying it to different locations - so portability is pretty important.  Also, the rooms are rarely darker than "dimly lit", and I have numerous high definition nature videos I want to show the kids.  I just need to be able to project a large screen-sized image - probably nothing more than 8' x 8' (a little smaller would be OK).

Obviously I can't afford a ton of money, but more importantly is getting the right specs.  I've looked at various reviews, and the different specifications leave me baffled.  Can you recommend a projector, or at least a reliable resource for helping me make the right choice?

Thanks,

Philip Simmons
philsimmonsAsked:
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Pancake_EffectCommented:
Could try a pocket projector if your looking for something small.

Don't look at this one's price, I just want to show you what they are.

Pocket Projector
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