This build has been an evolution of components since it's first conception in 2008. The only components still surviving from that build were a hard drive and optical drive. The most recent part is the Define R5 and Noctua fans, which I'm in love with! I set out looking for as much positive air pressure as possible in a silent case. My previous case was the Corsair 650D which had great temps on my overclocked 3930K, but was a noisy dust trap.
CPU: I scored a big deal on the i7-3930k a couple years ago and rebuilt this system around it. I mainly use my machine as Plex Media Server, a gaming machine, and various CAD/CFD analysis for school. So I needed something with a little extra kick. The six core i7-3930k blasts through all this at 4.6GHz on 1.3V.
CPU Cooler: If I didn't already have the H100, I would highly recommend the Noctua D15S. The H100 always performed well, with temps in my 650D never getting over 65 under full load on a 4.6GHz overclock.
GPU: The GTX 970 is more then enough to play all current games at 60 fps on my 1080p monitor, once I have a 4K monitor I may look into upgrading this beast.
RAM: Corsair is about as good as they get, I did have to RMA these six months ago due to one of the memory sticks only read 2GB but corsair's lifetime warranty was very easy to fulfill. The new memory is overclocked to 2133Mhz.
Case: I ultimately decided on the Define R5 with one goal in mind, four intake fans minimum. I measured the tube length on my H100 and length of my PSU and concluded I should be able to fit the H100 in the bottom. The reason for bottom mounting the radiator was to still allow the larger drive bay for my storage needs. I've had cases with windows and lights in the past, but for this build I wanted to try to be as silent as possible.
PSU: "If it ain't broke don't fix it" My ole trusty rocketfish 900W PSU handles overvoltage on my memory and CPU with no BSOD or boot up issues.
The build went pretty smoothly, tubing for the 240mm radiator was just long enough to reach the bottom only if I mounted the fans in a pull configuration. The mounting holes on the bottom of the R5 do not match up with the mounting holes in the h100, so I improvised and only the front most F12 is mounted to the radiator. The other F12 is mounted slightly offset from the radiator mounting holes (see pic). I took my time and am happy how the cable management options and ample tie downs in the R5 make it easy.