There have been several posts regarding the BenQ PE8700 and Carada screens. Here's my experience.
Several months ago, I began a project to turn my upstairs gameroom into a semi-dedicated theater room. After painting, blackout blinds, rugs, seating, pillows etc...I had to decide on equipment. I set a self imposed budget, and ended up purchasing a PE8700 and Carada screen, which fit nicely withing the budget. I also purchased a Kenwood 7070 THX Certified receiver & Bravo D1 DVD player hooked up by DVI cable. I continued to use my Klipsch speakers & subwoofer.
About the BenQ PE8700: It's heavy...well built. We hung it from a 10 foot ceiling using a Peerless mounting system. The mount is attached to the ceiling by 2 pieces of 1.5" wood that are secured into the ceiling studs. The wood is painted the same color as the ceiling and blends in beautifully. The PJ sits about 3 feet directly over the seats, so, for those sensitive to PJ noise, this could be a problem. The BenQ projector has a tendency to cycle between two speeds, as has been well documented. Fortunately for us, the noise is not distracting, as it simply sounds like white noise...A/C noise. We don't really notice it unless it is a quiet scene, and the PJ cycles from one speed to the other. However, we aren't very high maintenance with regard to noise...as we have 3 kids that have probably desensitized us somewhat to a perfectly quiet theater room.
The screen: As mentioned, we converted a game room into a semi-dedicated theater room. We have light control if necessary, but, we often leave the door open so we can hear what's going on with the kids in the room. This, of course, results in SOME ambient light. When we watch movies, however, we can shut the doors and achieve a very dark viewing environment. We purchased a 110-inch Brilliant White Carada screen for seating 12'6" away (16:9 aspect ratio). David also sent us two nice sized pieces of HC Grey & Cinema White screen materials...just in case. We took 3 or 4 days viewing the materials side by side (not individually as many like to do). Anyway, the BenQ doesn't seem to put out the full 1000 Lumens...I would guess somewhere in the 600-700 area is probably accurate...just by eyeballing. I don't know if the 2000:1 contrast ratio is legitimate, but, the BenQ PE8700 has NO problem with black images IMO. Only those that demand CRT type blacks would have a problem with the blacks that the PE8700 projects...and if that sounds like you, then, the Carada HC Grey screen would be a great choice. The BenQ combined with the HC Grey projected absolutely awesome blacks....deep, rich black images. However, if you're like me, it was at the expense of a "dim" picture, so, I didn't care much for it. Since I moved from a rear screen television to a FP system, I was used to a brighter, punchier image, and the HC Grey screen didn't work for me. IMO, I think most viewers moving from a rear-screen system to a FP system may have a problem with the grey screen...takes a little bit of getting used to. For us, the Cinema White and Brilliant White screen looked very comparable. Not a whole lot of difference in black images, but, a slightly brighter color output on the Brilliant White screen . Since ambient light was an issue for us...we ended up going with the Brilliant White. The image the BenQ projects on the Brilliant White is absolutely terrific....black images are very good (the BenQ does a VERY nice job in that area IMO) and wonderful colorful colors.
I appreciate those that will go out on a limb and provide a recommendation...so here's mine. If you demand a CRT type black, go for the HC Grey, but, be prepared for an adjustment period if you're moving from a regular TV to a FP TVB. The grey really does look different than the white (when side by side) If you have complete control of ambient light, then the Cinema Classic would be a good choice because it probably delivers a slightly better black image, but, I honestly couldn't tell much of a difference in my viewing environment. Therefore, if ambient light is ever a concern, I'd recommend the Brilliant White screen. With the PE8700, it produces very nice black images, and the accompanying colors are bright and punchy. A terrific combination IMO...I am thrilled with the results.
A short word on my Carada experience. I hired a local HT professional to assist me with the project. He also happens to be a Stewart dealer. When we hung the screen, he said he thought the quality of the frame and screen were comparable to his Stewart screens. He said that the Carada was a little easier to hang however. Also, Carada had the best customer service experience I've had in a long time...professional, prompt, and bent over backwards to make certain I had all the information I needed before purchasing...the 30-day refund provided for peace of mind.
Hope this was helpful to those looking at the BenQ PE8700 - Carada combination. Feel free to PM me with any questions. I'll give you frank, honest feedback based on my experiences and personal preferences.