The lwo ceiling does not bode well for your choices in projectors. While all that you listed are good, they simple have to much lens offset to accomodate your ceiling height without forcing you into digital keystone correction which degrades the image quality.
Instead, I would go with the Panasonic AX-100U (or 200U now?)
That projector can be flush mounted against your 6'6" ceiling and put the projected image perfectly where you want it on your wall. Not to low, not to high. The price also should be very close to your budget, yet you may have to wait on a rebate.
If you have problems finding that one at a great price, the Sanyo PLV-Z5 can be had for about $1K on VisualApex which is a site sponsor and just one of the best stores you can possibly deal with.
For that distance (about 12' viewing) I would use anywhere from a 106" to 120" diagonal screen depending on what the projector allowed for and where I liked to sit in the theater.