we bought 2 Hitachi CP-A200 for a tour next year. it is a mind trip to set a projector up 2 feet from the wall, and have it cast a bright 8foot tall image.
downsides are the resolution (which won't matter to much from 20feet away) and it needs to be a 90degree angle from your projection surface....it gets quirky if you try to tilt it to aim it specifically up or down.
the bottom of the projected image sits a good 15inches above the projector so it would be impossible to aim it right on the floor-edge of the wall.
the only good way to move the image up or down is raise or lower the whole unit.
also, this projector is HUGE... like a medium size suitcase
http://www.projectorcentral.com/Hitachi ... review.htm