"If you want to do it right you need to hire an expert."
(audiooracle)
Tranlation: Hire audiooracle to to do your room for you! (lol)
" I think having a room built for you by a pro can be a con if you are not careful." (chadnilz)
Basically it comes down to relationship here. Which is another reason that anyones advice here is just "air" and "ear-candy" Basically, your simply just not going to know enough to be able to discern what's going to be superb choices and advice vs, one persons biased oppinions!
That, and you'll never absorb enough information, to be able to put it all together. That's why you should consider pro's, and then see their work! If you like, you can be assured they know what they're doing. Even go to a clients home of theirs, from references, and see what they did.
Case in point: I went to a local AVS forum "local home theater meet", and checked out one guys full-on dedicated theater room, that ended up being featured in an electronics magazine. I personally, in my professional experience, thought the system was mediocre, and had lots and lots of design flaws, acoustical issues, setup and calibration problems, response issues, equipment cohesion problems, setting problems, poorly designed seating and and speaker setup flaws, HVAC noise, etc, etc! Basically, there was so much room for improvment, even though it was a "fun room", to be enjoyed. And, it's all good. But it could have been MUCH better, done by knowledgeable people!
So, depends on what you want out of it.
Basically, don't expect to read all the Audiogon posts, AVSforum posts, or Home Theater spot exposes, and even read some acoustics articles, and think you'll have a grasp on this stuff! It takes years of experience with this stuff to know what does what, in what room, with what gear, with what speaker/seating setup, with what acoustics, room construction, settings, etc, etc, etc!
Anyway, back to your questions-I like the advice here about getting help with the wiring, from someone who knows issolation and proper wiring for your needs, yes! Look for reverences on the forums.
Also, know that a company like Rives comes from a 2 channel background, emphesises 2 channel, and constructs theaters around that. IMO, not how a multi-channel system should be constructed, and especially NOT FOR MULTIPLE SEATING SITUATIONS!!! Take even a rectrangular or slanted trapezoidial room, sit in the middle of the room, and you'll have acoustial nighmares, that no EQ or room corretion can fix! (holes especially). That said, how many seats are you planning? What's the overall acoustics of the room, and engineering plans?
Good luck