Pardon me but an i7-3930 has a stock speed of 3.2 GHz, should easily overclock to 4+ GHz Yes, a six core is better.
Why would you want a Quadro 4000 board for in any case?
I would suggest you check ADK for better setup for Premiere
I'm not sure about the quadro 4000 that was the card suggested by Boxx. Of course it's expensive but they said it would be good for working with HD. I have never heard of ADK but they seem to have a lot a machine for the money. I will give them a call on Monday. Thanks for the suggestion.
As far as Premiere is concerned, the Quadro 4000 is roughly equal in performance to a GeForce GTX 460 SE (not to be confused with the regular GTX 460). You see, the Quadro 4000 has only 256 CUDA cores versus the GTX 460 SE's 288 CUDA cores. But at current street prices, the Quadro 4000 costs more than quintuple (read: five times higher) that of the GTX 460 SE. So, unless you want to frequently run modeling apps that can take great advantage of the more robust OpenGL capabilities of the Quadros, the Quadro 4000 is a total waste of money (especially since Premiere Pro takes very little, if any, advantage of the Quadro's enhanced OpenGL capabilities).