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Join Date: Jun 2005
Location: Northern, VA - Washington, DC
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Just in case it doesn't make sense yet, projectors must not only be mounted a certain distance from a screen, they must also be placed at a specific height in relation to the screen.
Some projectors offer flexibility in this placement because they include lens shift, which optically allows you to have some flexibility in placement.
Some projectors have no lens shift, some have a small bit of up/down lens shift (just a few inches), while others have a lot of up/down lens shift (measured in feet, typically compared to screen size) and also include left/right lens shift (typically just a few inches left/right).
So, if you want a projector that is really tight to the ceiling, then you aren't going to find many options as most people mount the screen higher. You can get a lot of lens shift from the Epson 5040. Not sure if the Epson 4000 offers as much lens shift as well, but that would be an option if it does. Otherwise, you must mount the projector so that the lens is about 3" or so above the top of your screen. The BenQ HT2050 may be able to go 4 or 5 inches above the top of the screen, but nowhere near flush to the ceiling.
I'm not sure of the lens shift on the Epson 3100, but it may offer a bit more range to get it a bit higher if desired. Not even a question for me on this one - I would get the BenQ HT2050 over the cheapest Epson models in a second (today). Then I would consider the Epson 3100 or better.