Not a problem!
Ok first...
FCP7 Havent used yet on the new Hackintosh, as its 32bit.
Fixed my FCPX issues, turns out there was some sort of hardware compatibility with the newest update of it (10.0.5) 10.0.4 works fine tho
My case fans are loud because they are CHEAP. I needed a massive amount of airflow, and didn't want to shell out 150 bucks on fans all at once when i'm spending 5 grand on eveyrthing else, so I chose to save where I could. Now, about a month later, i'm just about ready to upgrade my fans probably 2 at a time 30 bucks here and there is better =D. I am looking at the Corsair Quite Series.
I bought a gigabyte Mobo for my upcoming G5 Hackintosh (will be posting that within the next week or so) However, as I am still test benching, the system hasn't had a lot of "consistent" uptime.
I would HIGHLY Recommend an ASUS Server board with the amount of features, and the quality... can't be beaten in price.
As for the audio, didn't have any luck when using lion, but in ML, I stopped having audio conflicting problems and USB audio works fine (and thats all I need) so I havent messed with the onboard. If you are looking for 7.1 or 5.1 surround sound, there are USB flash drive size surround sound adapters (one is linked somewhere on like page 3-5 i believe on this thread)
CS5 works like a dream, but have yet to try CS6. Can't imagine there will be any problems.
Also, from what I have read, the GTX 680 works, but I have no personal experience with it.
Thanks for your questions, and please let me know if you have any more!