I'm looking for opinions on the Optoma brand of data projectors. I am considering purchasing either an EP770 or TX775 or TX773 for my church. The sanctuary seats approximately 200 people and has mid-level light issues, mostly from windows that are frosted with color. I would like to know about the quality of the image from these projectors (i.e. sharpness, color quality and range, viewing angle, etc.). This is a first purchase of a projector for the church, so I don't want to screw it up. Any suggestions you might have would be greatly appreciated!