After gagging to near-death after looking up the price for a ceiling mount for my BenQ 6200 projector, decided to make my own.
In short: A 1/2" thick pine board painted black with 3 holes drilled in it, spaced to allow screws to attach it to my projector.
Got a set of 2 satellite speaker mounts from Wal-Mart for $7.97 - they are the ball-and-joint type so I can angle/position the projector any way I want. Attach one end of the joint to the wooden board 'mount' on the projector, attach the other to the ceiling.
Works perfect, and looks pretty clean and professional as well. And I saved about $193. And I have another joint to mount something else if I'd like.