I'm putting together a proposal that includes a 50" Plasma TV that will flip down out of a ceiling (flat roof 2x12 joists). This is the better choice than to mount the TV to a marble faced, solid block fireplace.

I've done a few lifts for projectors (ceiling drop down - Chief) and plasma pop ups (Auton). But haven't done enough with either company to know who makes the better flip down. Any suggestions?