I have to echo Coder's suggestions. Pretty much what he said is the route I went. I got a Da-Lite High Contrast High Power 116" wide 2.35:1 Model C manual pull down screen for about $600 shipped. I use a Sharp XV-Z30000 I caught on a Woot deal for $1800.
I would go cheap on the screen and projector so you have something to satisfy you for now but if it gets damaged and the moving company won't replace/reimburse you, it won't be that big of a hit to replace it.
I'm in the service and move a lot too. I just got to where I'm at now and will likely be moving again soon.
Some things you've thought about is not many projectors have vertical lens shift or can do a short throw. You don't always know if you can ceiling mount it.
If you can and the depth of the room might truly be a small as 8ft, the only FPJ I know of that can do it (taking into account the depth of the projector and allowing for ventilation/wires) is the BenQ W1080ST. It can put up a 100" screen from 5-6'. It goes for about $1k.
The about to be released BenQ W1500 can throw up a 100" screen from 7'9", goes for $1500 and is wireless if that's also a concern for you.
The ViewSonic PJD7820HD and BenQ W1070 can both throw up a 100" screen from 8'4" and goes for about $700 and $900, respectively.
If you went that route to be safe, you could still use the Da-Lite High Power screens but, as Coder has said, you wouldn't get the full gain as they require the projector to be mounted as close to center screen as possible. It could still help w/ ambient light rejection though, depending on where the windows are located. It works well w/ side rejection but not as well if it's coming from directly behind you.
If you are worried about ceiling mounting it, you could go w/ the BenQ W7000 or Sharp XV-Z30000. They can both be used well w/ the High Power screens as their lens center point is the center of the screen. The BenQ can put up a 100" screen from 11'9" and the Sharp 10'5".
The BenQ can be had for $1400 refurbished or just over $1500 new. The Sharp seems to have gone up in price above $2000 but you may be able to find a used one.
If you chance it and go ceiling mount and a throw of about 11-12', you choices increase greatly. See PC's search tool to help find your options. http://www.projectorcentral.com/projectors.cfm