Hi, I'm currently building my completely light controlled media room in my attic. I'm finishing in the space with no windows. I will have a 20' long room by 18' wide. I'm purchasing an Optoma H79 and plan to mount from a suspended ceiling Chief mounting bracket. I plan to put the projector at 17.2' from the front wall to use a 110" diag Studiotek screen. Does this sound like the right screen and the right size for this room? It won't be too dark or too bright will it? I could go to 120" diag if needed. Again, the room will be completely light controlled and painted a dark, nonreflective brown. Thanks for any help.