Good list of stuff - all ROGgy with the red and black sleeving. Good quick RAM, too.
For a Devil's Canyon CPU - the 4790K - a Maximus VII (7 rather than 6) motherboard would be preferred. M7's were built for Devil's Canyon and use the slightly better Z97 PCH chip. My personal preference would be the M7 Formula based on the good results I've had with the M6F. I did the extra steps to upgrade my M6F for the 4790K, but you would be that much closer to a working rig if you start with an M7. M7 BIOS fan control is also a lot better.
With a Formula, you might try the on-board audio first before buying an additional card. Note that nvidia graphics cards like 16 PCIe lanes and must have at least 8. With either the 4770K or 4790K, the total available lanes are 16. Use of any other PCIe 3 socket shares lanes and reduces those available for the graphics card. You might download the manual for the card you choose and read up on the available lanes and the sharing. The 860W PSU is ample for expansion to two graphics cards - nvidia, but maybe not AMD - that will make the lane sharing issue even worse.
That's good cooling for a moderately overclocked gaming rig, but leads to one other comment - I have used MX-4 TIM extensively, but now am using Prolimtech PK-1 since it's about 1.5 times better thermal conductivity.
As always, these are my opinions. YMMV.
Jeff