I know this is quite an old thread, but I stumbled upon it and I'm currently trying to make the same decision. I'm looking at a 110" screen for my first projector setup, going to be getting the Benq W1070 as well, and will have a light controlled room in the basement, with darker gray walls, light gray ceiling and carpet that is on the lighter side. I will likely have SOME light on in the room, although it will be dimmed greatly, when I watch TV. I'll mostly watch 2D sports and movies but I can see myself buying a 3D bluray player in the future and maybe watching some 3D, so I want that to be an option, but it's not #1 for me. My wife's concern with going to a projector will be that it's too dim for her liking, so that's a consideration as well.
I was looking at the elite cinewhite screen, as you did, but after reading this thread, I'm wondering if I will need to get one of the Jamestown screens or the cinegrey screen? Since you had two of these, can you give your opinion? Anyone else who has more thoughts on this, I'd love to hear them. Thanks in advance!