Didn't like the build. It says at the beginning "the best moment to build a system", then the problems start. Yes, ati 58xx are powerful, but no competition in the market make them very expensive. More than they should be. I personally would have said the exac opposite: This is NOT a good moment to build a performance PC. For A LOT of money you are buying mid-end case, mid-end storage, mid-end cooling... heat issues in the prossesor (Good God 90ºC!), overclocking issues in the graphics cards... and 4TB for storage is a little excessive IMO, the same for the 8GB of RAM. 2x1TB should be more than enough, and 4GB of RAM is a lot even today. You could put an i7 920 and 3x2GB if 4GB total is not enough. And you have a better future-proff build at the same time, with westmere comming next year.
I'd say that the previous build, even with the already "old" 4890, is better in a more general perspective. It had water cooling, just to say one thing this build doesn't have.
Anyway, good work, nice review overall, not that good build.
Tl;dr: if I spent 2500$ in a rig just like this one, I'd rather be disappointed.