Change the EVO into a Pro and add another SSD.
the prices on the i7-6700k have gone up alot, and aren't worth the current prices. that leaves the i7-4790k or i7-5820k builds as better options.
the i7-4790k is similar speed but only uses ddr3. with the right motherboard it can be overclocked and use fast ddr3 memory, like 2400mhz +.
the i7-5820k is 6 cores and about 15-20% faster than the other 4 core i7's. the cpu may be cheaper, but the x99 motherboard costs more. the cpu may be the best investment for performance, and the x99 platform will also offer better upgrade options when broadwell-E is released.
Generic Guideline for Disk Setup samsung evo should be fine for os/apps, but pro is better and recommended for a cache drive as it has better endurance.
you may want a higher quality power supply than the "value series". at least 750w if going with the x99 build. higher watt psu's can help with higher/max overclocks too.
Yes, if you're considering doing being a digital creative, get the 6 core i7-5820k.
Digital creative workloads are one of the few areas where more cores is often a great boost to your productivity and the performance of your machine, in many ways that don't often become apparent until you work on something with less cores.
From file management to conversions to large arrays of vertex adjustments to anything that involves pumping data in and out of memory whilst doing something else, and especially for all the best renderers, more cores is best!!!