I currently have a Optoma Hd700x (HD65) that is projecting onto a 84" Elite VMAX 2 Electric screen (White). My only real complaint with this budget (Under $600 spent) setup is the black levels. My room also has white ceiling tiles and mint green paint but for the most part very little ambient light. I'm fine with the fact that it's only a 720p projector.
I have very low 7ft ceiling in my basement so I really like the form factor of my projector. If I went with an Epson or something similar in size, I would have to relocate my mount and all the wiring to the back of the room so that people would not hit their heads on the projector.
It does not seem like there are any high contrast projectors with a small footprint, with the HC4000 probably the closest but the lens offset is too much for my low ceilings without using keystone.
My question is, would a high contrast gray screen make enough difference in lowering the black level to be worth the investment or put the money toward a new projector if I could find one with a small enough foot print worth upgrading to?