Well.........Most manual screens are intended for a limited clientele that have a limited budget. As such, and with High Contrast Gray surfaces being more expensive than Matt White surfaces, you just don't find them on sub $200.00 screens.
Here is an example of a 92" Manual Retractable: In White, of course.http://www.htdepot.com/Focupix_Wides...169ax-92ms.htm
And here is a inexpensive Electric High Contrast Gray 92":http://www.htdepot.com/Focupix_HDVio...69ax-92-gy.htm
You have two choices. Either purchase the Manual and the coat it with a high performance, high Gain Gray DIY paint, or get the High Contrast Gray material on the Electric version and go with a "No Paint-No Work" scenario.
Of course, the latter will not provide nearly the same performance as the DIY project, but having a 8350 as you do, and with the image being as small as it is, if you can optimize your Throw Distance so your acheiving the highest levels of PJ Lumen output / Foot Lambert off screen possible, you'll probably do better than just get by.
It's a matter of deciding just how far into the realm of higher performance you want to go, as relates to how much effort and cash you can expend /spend. In fact...you would not spend all that much more....if as much as you would buying the Gray Electric version as you would getting the Manual and re-coating it, but the DIY version would absolutely outperform the standard High Contrast Gray.
If you decide to go forward with a hybrid DIY project, just re-post on this thread and away we'll go.