Sounds like we are doing the same type of work.
I think you are going a bit overboard in some areas, and setting yourself up for failure anyway by going the hackintosh route. Resolve for Windows is solid as a rock, and its a legit environment.
DO NOT EVEN THINK ABOUT USING A HACKINTOSH FOR PRODUCTION WORK! Worst. Idea. Ever. It will leave you stranded one day. Guaranteed. If you get a software / OS update it will blacklist your hardware. And you need to update your OS / quicktime in order to stay current with all the new codecs coming out. Your a pro, so use pro equipment. Apple is nothing but a phone company now. Theres more money in that arena, so I don't blame them and miss the OS. No excuse to stay with them though.
Also, xeons have nothing to do with resolve anyway. No need whatsoever. All processing is in the video card, and supporting most video cards in os x is pretty much a no-go. Especially hackintoshes.
I have been using an i7 machine (sandy bridge 6 core @3.2 hyperthreaded) using 2 gtx 680s, 32 gigs of ram, 128gb system ssd, a 512 gb SSD dedicated for cache, 6 TB raid 0 for media, and a 2 TB raid 1 for work / project files. Everything runs real time, even with an insane amount of different keys / mattes / windows in a shot. If its dedicated to resolve thats all the power you need. You can get away with less of a hard drive array if you wanted. I overclock because I also render cinema 4d and run after effects on it.
Not only is it about 25% the cost of a mac pro that can support resolve, but it outperforms it by a long shot as well. The reality is that Apple is no longer a power computing company, which is forcing those of us in post production over to windows. I am able to offer far more attractive turn-around and lower prices to clients than the majority of competitors who are clinging to their ancient mac pros for some reason.
Quadros are a complete rip off, and don't do anyone any good in reality. Its basically for software companies that would rather not test their software on so many different video card types / drivers and just have a short "supported pro card" list. *cough apple *cough.
If you are not overclocking, there is no need for that hydro cooler. But I have that H100 and am overclocking to 4.9 solid. I even render Cinema 4d for hours at 100% load for days and it never crashes.
For resolve, cuda cores are very important. When shopping for your cards, make sure you are packing in as many cuda cores as possible.
Also, stay away from apple monitors. You will They only make glossy now. Just stay away from everything apple for post-production from now on. Dell IPS monitors are good.
Thunderbolt seems to be dying away. A lot of 3rd party companies are dropping support and going USB 3 instead. It would have been nice for the blackmagic camera, but I just put in a SSD hot-swappable dock in the front bay of my machine and all is well.