If you are considering large venue projectors, try and get a 3chip DLP machine.
The contrast ratio of the big bright machines is usually the first to be sacrificed for brightness, but the 3chip machines are alot better at getting a decent contrast ratio.
check brands like Christie, Barco (most barco stuff is 240v) Panasonic, Eiki, and Sanyo.
Also as i noted, make sure the machine you're considering is 120v, unless you have 240v in your outbuilding. But really if you're going to make it completely dark in there, then you're probably going to need about 5000 lumens, so there isn't really a need for a machine of that 240v caliber.