Great rigs, they all look and perform extraordinary!
Yet there are parts worth 640$ more in the performance build compared to the others (ssd's and bd-re) which doesn't affect gaming performance, at least not in the way measured on the article - The ssd's probably do but you did not include loading times, minimum fps etc.
Also the liquid cooling value is rather questionable, given that it only added few mhz compared to the ~40$ (100$ less) rosewill fort120 hsf. Did you try switching fan direction / making push/pull config on the water cooling? I guess it'll cool the cpu somewhat better and still be quite enough to keep the system out of the red zone.
I know that's nitpicking and you didn't mind value in your 2500$ rig, and I really appreciate all the efforts and thoughts put into these systems, but that's still rather unfair since (gaming) performance/value was one of the criterias, when the 2500$ system would actually perform the same as a ~1800$ one.