These should help:
http://www.projectorcentral.com/projection-calculator-pro.cfm
http://www.ask.com/web?q=projector%20reviews&o=15527&l=dis&prt=NIS&chn=retail&geo=US&ver=18
http://www.projectorcentral.com/projection-calculator-pro.cfm
http://www.ask.com/web?q=projector%20reviews&o=15527&l=dis&prt=NIS&chn=retail&geo=US&ver=18