I currently have a 2500K but it's two years and am thinking about a new build. No gaming but I do a lot of video editing. I was looking at two processors, 3570K or 3930K. How much of an improvement would I get with each of these processors and would the 3930K be overkill? Or will Haswell be a bigger improvement? The 2500K is OK but would like something faster plus the internal header for the USB 3 doesn't work. So am I being foolish in buying a new CPU and motherboard? Thanks