Thanks for the suggestions airscapes
Yes, I went with a smaller screen size because it is a 720p projector, low output when in Eco mode, and also the room I am placing it in is not gigantic. 72-77" will still be fairly huge.
I have two sofas... one with a direct viewing angle of where I want the screen, and one off to the side. I have a coffee table in front of the sofas that are arranged in a "L" configuration. Until I decide what I want to do, I guess I could try placing the projector on the coffee table and projecting towards the wall.
In the long run though I'd prefer to ceiling mount it, so the angle is going to be steeper than the eye-level setup you are suggesting. I'd like to go for a clean look if at all possible, with the future potential of swapping out the projector if i decide I like it and want to step up to a 1080p. I guess this kind of rules out the High Power screen.
Any thoughts on the Cinema Vision 1.5 gain that DaLite recommends for Low output projectors? Also, would a .9 or 1.0 gain look terrible with LEDs because they are dim to begin with?