4K is quite expensive.
For that I'd be after either the 4670k or the 6 core Intel cpu around the same price.
I'd also expect something over a 570, but I'm guessing you're not exactly gaming (and GPU has very little to do with photoshop work).
Massive overkill on the power supply. I have a gtx680 and I'm running nothing like 1200 watts.
"High fidelity" sound card needs "high fidelity" speakers and if I had 4k to burn on a box, I'd be looking at maybe half that going on speakers. When I did, I did exactly that and boy am I not sorry about that.
7 external drives is terrible, you should have got a QNAP (or alternative).