Not an answer about the cpu but I would go for a faster non green hdd.
>WD Green 3TB hard drive
Very bad idea for video editing... you need at least two 7200 RPM drives... 1st for Windows and all programs... 2nd for project and video files
As John stated, that WD Green is not a good choice for a hard drive in an editing system, primarily due to its power-saving spin-down-to-a-complete-stop feature that cannot be defeated at all whatsoever (this means that the hard drive will spin itself down to a complete stop in the middle of an editing or encoding session, which can - and does - make an NLE operate very unstably). In addition, that WD Green spins at only 5400 RPM even at its full speed, which will affect both sequential transfers and access performance.
Other than that, there is little reason to get a GTX 780 for such a mainstream Haswell platform if you're going to use the GPU strictly for GPU-accelerated performance in the Adobe Premiere Pro CS6, especially if that WD Green maxes out at only 120 MB/s in sequential transfer speed and you're not planning to put any additional spinning hard drives in that system. And two of the other cards on your list (the GTX 660 Ti and the GTX 680) are now EOPL (End Of Production Life). The replacement for the GTX 660 Ti is now the GTX 760 (which, by the way, performs faster than the GTX 660 Ti). But given your planned disk setup, even the GTX 760 is overkill. With a maximum hard disk transfer speed of only 120 MB/s, you're better off with the GTX 650 Ti (non-Boost) or even the plain, non-Ti GTX 650 for that system. (I'd recommend the GTX 760 only if you're planning to get two Seagate 7200.14 hard drives and configure those in a RAID 0 configuration, and you're planning to overclock the i7-4770K moderately.)
As a matter of fact, with such a slow disk for media, projects and exports, you might want to step all the way down to a GT 640 (the new V2 version with DDR5 VRAM): Although that card has only a 64-bit memory bus, its DDR5 VRAM still has 40% greater memory throughput than the original GT 640 (which used 128-bit DDR3 VRAM): 40.1 GB/s versus 28.5 GB/s.