Hey, I have no problem giving any details necessary to keep me from making a bad screen decision! :-)
The screen will likely be a 4x3 120" diagonal (I am constrained on width due to a intake duct that can't be moved). I can't be any wider than 7'9" at the top.
The room can be made completely dark since it is in the basement and the windows that are there barely get enough light to see as it is (and they can be completely covered. On occasion there may be light from an adjoining room (indirect... not anything where a light would be in line of sight with the screen) but that would be during casual viewing when the kids were awake (not during a serious DVD watching session).
The walls in the room have yet to be painted, but we were leaning towards a light neutral color. It's not written in stone so let me know if we should consider other choices.
In terms of dark blacks... I used to project on a plain old medium gray painted wall (meant as a temporary solution)... we're not even talking about projector paint; this is plain old hardware store flat house paint. With that, I didn't mind the brightness of the white and light colors. I don't want an excessively dark picture though, and I guess my biggest fear is that watching something like Star Wars, i will see the backdrop of space as a medium gray instead of a black or near black.
The long and the short is that blackest blacks are a higher priority than having the whitest whites, but contrast overall is my gravest concern (I know I know... dump the LCD projector and buy a PLasma, right? lol).
The viewing area is set up so that 80% of the time, nobody will will have anything worse than a 15 degree viewing angle (15 degrees off of straight on that is). The other times (largely because the TV room is relatively long and narrow), some people may have to view the screen with up to a 30 degree angle off of straight on. Angle of view is probably not a big issue with us.
So imagine us having a 19' x 10' TV room, with the projector projecting lengthwise, with two rows of seating in the back (facing straight ahead at the screen pretty much), and a single couch along one wall where people's heads would be in line with the left edge of the screen... there won't be anyone off in the wings tryign to watch from a 45 degree angle or anything like that. Also, the room can be darkened ot close to absolute black if needed.
Thanks in advance for any help or feedback!
(P.S. Did I say that price is a consideration? We are not rich... damn those tech stocks for tanking. lol)