I've just finished going through this process, and I ended up with a Stewart Greyhawk.
Depending on viewing distance, a gray screen is a good consideration. I'm viewing from about 9.5' from the screen which is almost directly under the projector. Others will recommend a + gain screen around 1.2 or 1.3:1 as an option for more "punchy" presentation.
It's loud as heck so you must do something with the noise. I have a hushbox on order myself....
Here are a few images, all are around 320x240.
First, is the Greyhawk by itself to give you an idea of the "grayness" of it. This is standard color, .95 gain. A friend of mine who's using a very bright projector just ordered a .82 gain (or something around there).http://www.mindspring.com/~kotches/m...wk-2-small.jpg
The next shot is Joe Walsh on Pretty Maids All in a Row
-- note that this image was projected on a white sheet. The picture is better than you'd expect, but I had done no tuning of the display whatsoever. Take a look at the background between Walsh and Felder, and note the blueish light. The white shirt is a touch greenish which was probably the color decoder.http://www.mindspring.com/~kotches/m...frey-small.jpg
Followed up is the same shot projected onto the Greyhawk with no tweaking of the projector at all. Wow things are very muted here! The grey kind of drags down the blue between and makes the white short seem almost, well, gray!http://www.mindspring.com/~kotches/m...alsh-small.jpg
Finally, this weekend I pulled out VE to do some initial settings of the "Four major food groups" for video: brightness, contrast, color, tint. I'll have another post about some issues with that a little later. Check out the blue between Walsh and Felder... it's well, blue! Joe Walsh's shirt is much closer to white. Don Felder's "grunge look" plaid shirt isn't ready to throw away just yet ;)http://www.mindspring.com/~kotches/m...ated-small.jpg
Now this is far from "fully calibrated", I don't have the toys to set Gray Scale yet, nor am I a video expert -- but even with my relatively untrained eye a nice improvement was wraught from a pass with Video Essentials.
Hope this helps.