Good Projector?

My sister wants a projector for her classroom, and my dad asked me to look around for a good one. So, i turned to you guys. I am completely projector clueless, so good brands, what brightness, and any other help is greatly appreciated.

I had been looking at this one-
http://www.newegg.com/Product/Produc...82E16824140036
mainly because it seemed to have good resolution.

I don't think this matters, but it has to be mac compatable.