first, game machines are based off maxing the graphics. most get by just fine with an i5 and a high end video card or two or three. video/graphics programs are the opposite. they use the cpu much more than the graphics, and in some cases like AE, use the graphics very little to none. video games are still primarily 32-bit applications, which only use 2 cores but usually run better on 4 core cpu's. most video/graphics programs are now 64-bit which will make use of as many cores as given. the problem is with bad/sloppy programing, which adobe is guilty of. parts of the program are still single threaded, 32-bit based, and therefore can bottleneck the program as everything has to wait just for one part of the program to finish. AE is guilty of this, as many of its effects are still 32-bit and ruin its performance. they have their tricks to help get around it, but its still terrible. they are supposedly working on updating it to be true 64-bit and use the graphics card to catch up with the other major players in that market, but who knows when they will do that. these may be some of the things he gets frustrated with, as would anyone who buys a fast computer only to have the software bottleneck itself. this is becoming extremely important as intel is adding cores and dropping its clock speeds to gain performance/speed. intel has some xeons with 12, 14 and even 18 cores. that 18 becomes 36 with hyper-threading! any program thats not full/true 64-bit could bottleneck a $50,000 super computer into a $500 dell. this is why its so important that software companies get their act together.
so for parts, if you need to save money build around a i7-4790K and possibly re-use your ram. if you have the budget, get the latest and greatest, the new haswell-E. the i7-5820K is best value, but there is also the i7-5930K and i7-5960K. the new haswell-e takes ddr4 ram, so you wont be able to re-use your ram. ddr4 also costs a bit more as its new tech. if you are overclocking and paying for high-end overclocking components, then you can afford to go with the haswell-e.
Well I am building a X99 based system for myself. But cannot spend too much time with details right now. I will try to do more details but my motherboard is the ASUS X99-E WS because of the many PCIe lanes and the onboard m.2 x4 socket. This is the future, no RAID required, no hard drives.. I just was able to acquire a Samsung SM951 m.2 SSD and the Premiere Pro write rate with our PPBM was 1483 MB/second! That is better than 10 times your best hard drive performance. Read rate around 2000 MB/second.
Bill, wonderful rig you're building there. Seems the budget is a bit above what I can currently justify. Green with envy, yes I am!
However, any comment you could make real quick on my above parts list would be VERY useful.