Chasby, since I recently bought a sharp 12000 I will give you my experience with is since its of the projectors you might be considering, being the second sharp projector I have purchased, the first being a sharp 9000 I will tell you that they are pretty easy to set up and the lens shift feataure to me is extremely helpful. In the past I have passed up projectors that had excellent pq but lacked the vertical lens shift feature that the sharp had, I could have purchased the benq 8700 which is a great unit as well however it did not have the lens shift feature and the idea that I might have to have a long pole descending from my ceiling to accomodate the correct lens position didnt appeal to me at all. You say youre looking for a 120" screen, the sharp has an excellent picture quality and because it has one of the highest contrasts for a dlp ( about 4000:1) in high contrast mode thats usually the mode that users such as myself select however once that mode is selected light output drops considerably and Im not sure if projecting on a 120" screen in high contrast mode (if thats youre desire) will be bright enough for you. personally I will in the future be ordeing a silverstar, it has a screen gain of 6.0 but for now I have built my own frame using draper m2500 screen material which has a gain of 2.5, the screen is a custom size, the material came as a 60" x 100 " section so I made the screen 50" high x 90" wide allowing the extra material to be wrapped around the frame, my seating distance is about 15ft and the picture is wonderful, my ultimate plan is to possibly go with a screen size such as what your looking for but the only screen I know of with a high enough gain to give me a great image at that size is a vutec silverstar and It doesnt come rolled up it comes as one solid piece becase its very rigid but delicate so my advice to you is if youre considering a projector like the sharp 12000 or any projector with that kind of lumen output (900 ansi) and want a screen image 120" then I would definately look at a vutec silverstar.
hope this helps..
hope this helps..