I do not know enough to answer your question regarding RAID. However, I did notice that you wanted to get an i7-3960 CPU. I may not be a guru but from my experience with the i7-3930 and what I have read since those processors came out, there is not enough of a difference between the two chips to make up for the price difference. I'll even risk to say that you'd be paying an extra $500 just for bragging rights. The i7-3930 is just as good, just clocked a bit lower and has 3 megs less L3 cache. Once you overclock the 3930, it basically performs just as well as its much more expensive brother.
Save money on your CPU and put it somewhere else where it will make more of a difference to your system.
Uncompressed HD source data absolutely requires RAID big time, unless you have the money to have a hugh SSD drive system. The Blackmagic camera requires on the fastest SSD drives so you would have to have all your media on these drives or hard disk drives RAIDed. You might have to have each layer on a seperate SSD
Also with your high resolution you probably need a 4GB GPU such as those just announced
Bill, well how can I not take your advice!
A raid card it is! Either Highpoint or Areca I am guessing and some enterpise Hitachis maybe. As Nicol pointed out if I saved a little on the processor it goes half away to the raid card anyway. I apologise for the newbie 'false economy' thinking;) I can envisage if i did shortcut I'd be kicking myself immediately within the first project.
If you go with the 3930K, another absolute must is to use the latest BIOS. For both Asus and Gigabyte this was released at the beginning of April, and is numbered 10 in the series. Earlier BIOS versions have problems with memory compatibility, and resulting system freezes and poor performance.
Some people say that you can achieve stability only with 1.35V memory, but my system never misses a beat with Corsair XMS3.