chess,
You just don't convince me to give it up! HEH-HEH-HEH...
(1) Who cares if one has to duck down when passing the line of projection? How many times do you or your partner have to go to bathroom or laundry or wherever during a movie show? It's not a commercial theater. My projector is table-mounted near the back wall of the busy living room (this was necessary to maximize the benefits of the retro-reflective screen I bought) -- every time somebody has to go somewhere, he/she will cross the light, and nobody cares!
(2) The off-center issue will NOT kill the possibilities at all. Quite a few projectors (including the excellent $1500 Sanyo Z1) has the nifty "lens-shift" feature exactly for the situation like yours, which allows the projector to throw slightly sideways (or upward/downward), without keystoning. It is done all optically, so no digital correction involved. Even if the projector do not have lens-shift, you can always corrent the keystone digitally...
