There is one significant problem with that system:
If you picked a non-modular CX750, be forewarned that it cannot handle anywhere near its advertised "750W" rating. In fact, it barely qualifies as a 550W PSU in realistic conditions.
And that Quadro M2000, frankly, performs almost exactly equal to a GeForce GTX 950 - but it costs nearly four times as much money.
which gpu is needed will vary depending on how many gpu fx and lumetri color fx are used. 6700k and quadro m2000 are more for HD/1080p editing. if you don't need 10bit display the gtx 960 4gb will be faster and cheaper for HD. if you are actually building for 4k you will want to look at the 6-10 core i7 cpu's overclocked on the x99 platform, with a faster gtx or quadro card. if you only need 10bit for a second monitor as full screen playback, you can use a gtx card with a display i/o card from blackmagic or aja.
large air coolers do pretty well and have less to fix/replace when they break. noctua air coolers are some of the best, with cryorig not too far behind.
if you want a quiet case, you can look for cases like the fractal design r5 or some of the corsair silent cases.
i would stick with samsung ssd's, 850 evo are affordable. its ok to have the cache files on the C: drive with os/apps. if you are using the scratch setting for video capture, then it would be best to have it on a fast isolated drive.
i wouldn't want to entrust all that hardware with a lower quality power supply. corsair power supplies, like most other brands, are hit and miss. the corsair rmx or rmi models are good, but not the older corsair rm. evga g2 models are also good quality.
Thanks for the replies, I am still happy with the workhorse M2000 but will seriously look at a better power supply.