UPDATE July 2017:
Build and parts list updated to reflect the upgrade over summer 2017. Swapped main display from 4K to a 2160x1440 at 144hz. Upgraded to SLI 1080 Ti. Installed full EKWB watercooling loop.
Previous build description: I've had a decent enough gaming rig for a while but still wanted to update my system to something that would be powerful for as long as I'd had my last computer (4 years).
I'd had the two 1080s for a couple months in my old rig and was having some bottlenecking issues, I'd been building up this parts list for a while to build up a white/silver and black accented aesthetic build, and one day after I received a large paycheck and found out most of these parts were at least a bit on sale, I ordered the rest of the PC, built it up, and migrated everything from my old PC over in a weekend.
The rest of the peripherals (everything except the PC tower) was accumulated over the course of the past year.
I really loved building the system and it was a breeze for everything. The NZXT Phantom 820 is such a massive case that even with everything installed I still have plenty of room for when I water cool the whole thing. The only one issue I had with the entire process was that the molex connector going to the built-in fan controller for the case was bad and would not power the fans. I had to use a header splitter that came with the CPU cooler to get a few working while waiting on a replacement. Other than that there were no issues, everything installed and set up just fine and has been working great for about a month now.
I've overclocked the CPU to 4.5 GHz, but haven't played around with the 1080s yet. Depending on whether the game supports SLI or not, it will do 4K gaming at 60 FPS on max settings with no problem (GTA V looks really good).
Something else with this PC, with the Vive headset on my old computer I was never able to set the headset camera framerate to 60 Hz, it would just never work. I used it with it at 30 and that was okay, but after getting things set back up and reconfigured on this new PC, I bumped the setting up and it works just fine. I was running VR well enough on a 980Ti before, but this setup clearly crushes that performance.
All in all, I'm really satisfied with this computer. It was my first real PC build, and my first time really experiencing an SSD. Boot times are super quick, while still having a huge amount of storage for my game and music libraries. Could I have done some things differently, maybe saved some money in certain areas? Probably. Do I really care? No.