hi I am looking for a gray screen for my living room but I have some ambient light. I've looked into the SI Black Diamond however it is a little pricey. What other screens can you recommend that are cheaper but with similar performance to the SI screen.
Da-lite High Contrast Cinema Vision
I own both of these screens ( I consider the HCCV the " poor mans Firehawk " ). They both work well to maximize contrast, and minimize the image washing out with some light in the room. Or, you could possibly use a High Power screen. 20' is a long way from a reasonable sized screen ( I sit 12' from a 120" diagonal screen, just FYI ).