...so I never have to get out of the same chair to watch movies, listen to music or play games.
I wanted home theater quality audio for both games and movies. The system is calibrated with Dirac Live, which is necessary to get a good full range frequency response without peaks, nulls, and reflections. After getting used to a calibrated system my older headphones wouldn't cut it anymore, so for quiet listening I had to upgrade to the Shure SE846 which has a full range response and even competes with the bass from the SVS PB-2000 subwoofer!
Regular headset microphones were rendered useless while gaming due to the sheer volume of the audio system. For my voice to be audible in-game, I had to get a professional cardioid microphone and amplifier which would pick up my voice at close range - the Shure WH20XLR and Shure X2u.
I enjoy 3D games and movies, so the Asus ROG Swift PG278Q was the only monitor that had it all - 3D Vision, G-SYNC, 144 Hz, and a screen big enough for movies. To sustain 60 fps at 2560x1440 in 3D Vision, I had to get a second GTX 1080 for 2-way SLI. I also got an Oculus Rift.
I had to go server-grade for the UPS since no consumer UPS could handle the instantaneous power surges to the subwoofer without melting (even while running on the mains!). The APC Smart-UPS series is designed to handle brief overloads.
For bulk storage, I used the new Storage Spaces in Windows 10. I created a two-tier Storage Pool with a HDD tier, and an SSD tier for write caching and frequently accessed data.