That screen will be fine but I'd recommend thinking about something like a used firehawk. Projectors will get better and youll want a new one some day. If you buy a good screen, youll never want a new one. screen technology isnt moving fast, projector technology is. Personally Id rather have a $1k dlp and a top shelf screen than a better projector now. Youll do fine either way tho. As to the windows, it really depends on how much light is hitting the screen. The sun can really beat up an image quickly no matter what screen you use.