Originally Posted by DunMunro
When you visit a movie theatre you'll notice that the screen is well above your seated position.
Most properly designed theaters have the center seats hitting about the center of the screen for eye level.
Few theaters have it up high or down low.
But, really the typical setup has the eyes falling about 1/3 to 1/2 way up from the bottom of the screen, so there is room to have it a bit higher.
TYPICAL SCREEN SIZE: About 10" to 12" of diagonal for each FOOT of viewing distance. 100" to 120" diagonal is typical.
It is recommended you get the projector first, then decide upon a screen size. Just throw a white sheet up on the wall for a bit and try out 100" to 120" or larger/smaller and see what you like best. Don't let us decide for you based upon our own preferences. You can also try different heights.
It does look like you can ceiling mount, and maybe bring it a few inches closer if needed if you want to go smaller. Really, you have about 11' or 10.5' lens to screen to work with.
IMO - This is an ideal setup for the BenQ HT2050a.
From 10.5' lens to screen, it can give you an image diagonal between 96" and 125" diagonal. Right what you are looking for.
The HT1070A is a bit cheaper, and may be a solid option, but from that throw distance will be a bit smaller. You will need a few extra inches of throw distance to hit 110" diagonal...
I would go with the HT2050A and call it done.
Yes, painting all surfaces 'darker' would be recommended.