Coderguy, I'd love to continue this discussion but you have some facts wrong. First any decent acoustic class demonstrates the difference of different placement of speakers. A/B in different set ups is something I have seen many times as I am sure many other professional have. As well as having A/B's screens side by side and not samples. But to not take this discussion off topic the OP already has a screen and it appear speakers. That part of his system is done and probably doesn't want to spend more money trying to change it. So it doesn't matter the differing opinions that is not what he is asking.
Gomdaf, an A-len is the best solution for a scope screen. The zoom method is a poor man's method. You have the budget for an A-lens and the lens is something you can use if you upgrade your projector in the future. The website I linked has information on which projectors will work and I think we all agree it is either the Epson or Sony. Both are good projectors and each has its tradeoffs. The first thing to look at is will the projector fit where you would like to mount it? Not only the throw distance but the amount of vertical lens shift you may need. They both should work for throw distance where you plan to mount it. Where is the projector going to be placed in relation to the screen's height? Is it going to be above the screen? If so how far above? It is tough to tell by your pictures what the height difference will be. The Epson has a greater range of lens shift and I'm sure would work, the Sony probably will but if it doesn't are you willing to lower it some? You'll have to decide what is best for you.