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I must agree with Neil. The situation you describe (light and vaulted ceiling) can present problems for front projection units.
First, the light situation. During the day, the ambient light would require a high lumen output projector, but at night such a picture would be too bright and probably not have the contrast you want in a home theater. At work we have some Panasonics that put out plenty of light, but only have a contrast ratio of 400:1, which does not look especially pleasing in a dark room.
Second, mounting from the ceiling would be a problem since the projector would literally stick out like a sore thumb hanging from the ceiling. You would need an A/V cart or other piece of furniture that would place the FP six or so inches above where the bottom of the image would be on the screen. Otherwise you need to employ the keystone correction which degrades the image. You would then need to consider how to get the cabling to the projector. Most projectors (unless you can find one with a long throw lens) need to be about 14 feet from the screen (assuming a width of 100 inches or so).
Having said all of this, you can not beat the impact that a large image has in a home theater. All things considered in your situation I would opt for a RP or plasma display.
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