Welcome to the Dragons Claw.
Some of these parts are carry overs from my last system (like the monitors, BD/DVD drive, HDD) Also, PC Part picker sucks at deals. I got the motherboard for around $320 at Frys because I Amazon'd it. Same with some of the other stuff, so the large price tag built here, does not reflect what was spent.
To answer some questions: No liquid cooling - yet. Intel needs to release their Gen3 Socket 2011's before I take that step. The OCKey is still...problematic.
This is mainly used for gaming mostly, multiple games running simultaneously across various screens. (3-5 at a time)