I have an older svga DLP projector that is 4x3 format. I'm building a 20x28 foot theater room and plan to use a 10 foot wide screen but I've become confused about the aspect ratio I should get. 16x9 or 4x3 ?? Is it best to go with the larger 4x3 screen and live with the letterboxing for dvd's? Is it better to go with the 16x9 screen and don't watch 4x3 stuff? Are there scalers or doublers that can deal with the formatting issues? The masking screens look ideal but are big $$. Is there a right choice?