Well, this is gonna take me a while to go over.
Basic specs:
Mobo: ASUS ROG MAXIMUS VI HERO
CPU: Intel Core i7-4770K (4.6 GHz)
RAM: 32 GB (4x8 GB) DDR3-2400 (back when you could get that much for just $150, what the heck happened to DRAM prices these past few years?)
GPU: NVIDIA GeForce GTX 980 (reference model with blower HSF and stock clocks)
Sound: Creative SB X-Fi Titanium HD / Sennheiser GSX 1000 (I switch depending on which headphone virtual surround I want at the time)
Video input/capture: Startech PEXHDCAP (Micomsoft SC-500N1)
USB: FL1100EX-based host controller card (hey, those Oculus Rift sensors sure love their USB 3.0 ports!)
SSD: Samsung 850 EVO 500 GB
HDD: 4 TB (dual 2 TB 7,200 RPM RAID 0) Seagate array to hold my HDDs, 1 TB Samsung HD103SJ as an alternate OS boot volume, another 2 TB 5,400 RPM Seagate drive for misc. data storage
PSU: EVGA G2 1300W (yes, I am fully aware of how overkill this is for my current setup, but I wanted to be sure I had power to spare for a HEDT build around i9 or Threadripper later on)
UPS: APC Back-UPS 750 (found it practically unused for $12 at a Goodwill with a working lead-acid cell, would you believe that?)
Case: Corsair Obsidian 800D
The CPU cooling system pretty much needs its own little list, as it's a custom water-cooling loop. Used to cover the GPU, too, at least until my GTX 480 died and the replacement 760 and 980 didn't really need to get blocked.
-Laing D5 pump/dual 5.25" bay XSPC top/reservoir
-Hardware Labs Black Ice GTX 360 radiator + 3x Scythe S-Flex SFF21F 120mm fans (maybe not the best choice static pressure-wise for a dense, thick rad like that, but I already had 'em)
-XSPC Raystorm full-copper CPU block
-distilled water and biocide (no need to get fancy there!)
Peripherals:
-Eizo FG2421 120 Hz VA LCD (a substitute for my dearly departed Sony GDM-FW900)
-Wacom Cintiq Companion Hybrid (secondary touch/pen monitor, and also an Android tablet in dire need of an update past 4.2.1 Jelly Bean if any of you can help me figure that out)
-Kinesis Freestyle Edge (Cherry MX Blue switches, split design that won me over from my trusty IBM Model Ms)
-Swiftpoint Z mouse
-cheap computer speakers not worth mentioning
-Sennheiser PC360 and GAME ONE headsets (I'm at a bit of a tossup as to which I like better at this point)
-Oculus Rift CV1 + Touch controllers + quad-sensor room-scale setup
-Xbox One gamepad + wireless receiver (Rift pack-in, of course)
-Thrustmaster HOTAS Cougar + RealSimulator FSSB R2 stick mod + Simped VARIO pedals + Thrustmaster MFD Cougar button frames
-Thrustmaster T300RS wheel and basic two-pedal set (aiming for better pedals and the TH8A shifter add-on later)
The core components certainly aren't the newest, but they work adequately for now. I'm mainly waiting on the Volta equivalent to the GTX 1080 Ti at the moment, and beyond that, hoping to move into i9 or Threadripper, whichever strikes the balance of high single-threaded performance with plenty of extra cores to spare, and even more importantly, PCIe lanes to spare once I start dabbling in things like NVMe SSDs, quad-channel USB 3.0 host controller cards and video capture/framegrabber cards that need PCIe x4 slots. Mainstream i5/i7 and Ryzen aren't cutting it in the PCIe department right now.