This is my main PC for both work and play.
CPU: This was a no-brainer at the time I made these purchases (early 2015) mainly for futureproofing. It's overclocked to 4.7GHz for the time being.
Heatsink: The stock Intel cooler was giving me alarming idle temps of 95 degrees Celcius at base clock, forcing me to get the 212. It was a pain in the neck to install but temps are decent with light overclocking and an extra exhaust fan.
Motherboard: It was reasonably priced for having 4 PCI/e slots and USB 3.0 only. It's a good sport about overclocking.
RAM: Overclocked to 1800MHz at this time, but maybe higher later. Honestly, I see little point in having more than 8GB unless it's a workstation, but some will digress on this.
Storage: 1 SSD for the system, 1 for games, and a hybrid drive for media. I learned to split data among drives after destroying the file system on my old drive.
GPU: As strange as it sounds, I had 3 470s laying around for use. They're air cooled and they're noisy if it wasn't obvious enough, but I can play most games at at least medium settings in 1080p in SLI. At least the blower-style coolers prevent the heatstorm in the cards from taking the rest of my system as well.
Case: It looks great and the features are just as great. The 3-drive bay cage leaves ample room in the case and space for radiators in the future. Personally, I see little gain in moving an SSD to the rear mount. The inclusion of space for 3 200mm fans is a big plus as are the fan filters and rear I/O lighting.
PSU: A large power supply from Rosewill without the ridiculously large price.
ODD: Just a simple DVD and CD R/W combo drive from a previous build that's hardly used.