Dalite and Draper have very similar quality screens, but it should be noted that a Carada screen (fixed frame) costs less at full MSRP than either Dalite or Draper can touch.
At a 12' viewing distance, the proper screen size is about 110" diagonal, not 92" diagonal. You are well under what I would recommend in your situation. A Carada Brilliant White screen will run you about $890.00 shipped to your door.
http://www.carada.com/ProductInfo.aspx?productid=PROJECTION-SCREEN-H110C
Sharpvision XVZ 3100 HD DLP projector
I have seen pretty good results with the Sharp projectors, but I'm not sure how much this model really stands above the Optoma HD70 which is $1,000. Likewise, the Panasonic AX100U is about $1,500 and is a very versatile projector for both setup and brightness. If you aren't going 1080p, then I might opt for a slightly cheaper projection setup over a (barely) nicer projector.
If you want HD disc formats, then it isn't a bad choice, but I would strongly consider holding off for a year until the HD disc wars have played out a bit more. If you really want HD discs, then perhaps a PS3 or X-Box 360 w/HD DVD add on will work for you. Bottom line is that going with either Blu-ray Disc or HD DVD right at this moment is a gamble. But, as a PS3 owner, and a person who has critically evaluated HD DVD, I can say that the QUALITY from either format is truly amazing on a 110" screen.
Truaudio HT66A in wall flush mount HT speakers
Truaudio Sur.1 surround rear channel in celiling
I'm unfamilar with these speakers, so won't comment. Generally speaking, you get what you pay for with ceiling speakers. If you have the option of going in-wall or on-wall you can often get a lot more bang for your buck in overall audio quality. But, this isn't always feasible I'm aware.
Likewise, I haven't heard of/seen this receiver and their website doesn't list it anywhere except here...
http://www.yamaha.com/yec/products/productdetail.html?CNTID=200028&CTID=5000600
and it is DEFINITELY a stereo receiver, not a surround receiver.
For $550.00 you can do a fair bit better... from Yamaha even:
http://www.yamaha.com/yec/products/productdetail.html?CNTID=547398&CTID=5000300
Other companies including Denon and Pioneer will have similar offerings.
Of course, you still have to add labor and you have to consider that part of the labor costs may be offset by MSRP pricing, which can (fairly) affect the bottom line.