Originally Posted by AV_Integrated
Depends on how much quality you are asking for. In a room with light walls/ceiling/carpet, you may find some benefit when viewing with a .8 gain grey screen. It will help to drop the black levels a bit, and the extra brightness the projector puts out can be utilized to retain a sharp image with a lot of pop to it.
Typically a minimal (1.1 to 1.5) gain screen of decent quality makes the most sense, but if your room is not properly light controlled (shades aren't light control) then a grey screen may help with the light reflections a bit.
It remains the case that the single biggest improvement anyone can make to their front projection setup comes in the form of $50 in darker paint.
I want to add in what I did with one of the walls in my room that I liked and it was about the same budget as painting, without the mess.
I went to K-Mart and they had a sale on their curtains, so I bought a 103" extendable curtain rod (approx $5) and 4 curtain panels at about $10 per 2 (I went with slightly more expensive ones for better quality). I got black curtains, but obviously you could get any color you wanted. At any rate, covering the wall with curtains almost gives it a more "cinema" feel and costs about the same as painting, but, like I said, without the mess and a little bit less labor (as long as you're okay with screwing in curtain rods).
Just putting in another option for changing your room without messing with the paint and giving it a nice atmosphere (IMO).
Former 35mm and Digital Projectionist @ Regal Cinemas
Currently watching on: BenQ W1070, 106" 0.8 Gain Screen, Darbee, PS4, w/ Marantz SR6011, NAD C370 (for Front L/R), Outlaw Model 5000, SVS PB-2000, SVS PC-2000, a Def Tech CS-8080HD, 2 SM65 for L/R, 2 SM55 for sides, 2 PM1000 for rears, and 4 AW5500 for Atmos.