EVGA NEX PSU's are poor quality. Get a Seasonic or EVGA G2/GQ PSU.
Its a monster system really overbuilt in terms of the processor and ram. You could go cheaper and likely still get the same results probably save yourself $800. I say this because I own an IP camera system with the NVR that is included in the box, it can run 8 cameras and is the most basic of basic PC's. It really doesn't take much to run them. Serving files and media as well, unless you have like 8 people trying to stream at the same time, you don't need a 6 core hyperthreaded processor with liquid cooling (PS those Corsairs are known to be a bit noisy, so you won't even get the quiet benefit).
16gb of ram, or 32 if you want to be very very sure, an Xeon E3...