Type Lcos

I Need recommendation for a wireless PC projector for a class of 50 students.?

Please let me have your experiences regarding such type of projectors. Information such as brightness, speed, reliability, ease of use etc. are all welcomed. Thanks!
Also how about Cannon LCOS for home theatre use?

http://store.infocus.com/escalate/store/BasePage?pls=infocus&bc=infocus&page=Main&OVRAW=wireless%20pc%20projector&OVKEY=pc%20projector&OVMTC=advanced

check here

Mini / Pico Projector Demo