I was out-of-town for a few days but I am happy to see another fellow AV consultant has joined this post, he as offered some great advise, and as you can tell with any product their are different price points and features available. The main items I have advise my clients with after determining their budget, is how large of a viewing area are they considering, room audio/video setup and most importantly the ambient light factor contained within their viewing room. How much is controlled, color of the walls, # of doorway openings, do they want some lights on during their video viewing. Remember unlike TV's, Plasma's, Rear Projectors where you see the final product within a short distance from its source regardless of the above factors, a front projector must project thru the ambient light and reflect back the video source, then relect the ambient light. It is not to say that for optimal viewing a room must be completly dark like a movie theater. My only comments regarding viewing on a screen or home made surface (painted or other) is you have spent a fair amount to get the best possible projector for you budget, you should also purchase a professional built screen that matches your projector and ambient light conditions. Hope this help's, would be happy to offer several options based on an analysis of your factors as indicated above, please email me with any specfics.