Most of the newer projectors all have an off set that is designed for ceiling mounting with an 8 ' ceiling. Giving about a 8' to 10" drop to the top of the screen (most vary with screen size). If you don't care for 3D then Newegg has the HD8200 for $699 and it has a large amount of both vertical and horizontal lens shift and preform better than anything for twice the price. The Mits HC7900dw has a very large off set and some vertical shift to increase the off set if you can still find one.
"Smart enough to know better, to old to care" ------ Dedicated Home Theater, Mitsubishi HC7900DW Projector, 110" 16:9 Jamestown screen with variable power masking for CIW 2.50:1 to 16:9, Marantz 7009 with 7.1.4 Atmos with Ohm mains,3 DIY Subs (2 15" (1 ported, 1 sealed and a 12" 4th order bandpass), 1 DIY butt kicker, Custom Built HTPC, 10TB DroboFS NAS