I've build this PC. I'll be using it for Gaming, streaming, hd video editing and maybe using it as a server when i build another computer.
Reason I choose the i7 is because i need it for the video editing, if this was just for gaming. I would've used the i5 instead, I will be clocking it a bit higher soon, but right now, It's not needed Everything runs smooth and no problems at all.
I really love the noctua NH-D14, I will probably been using some other fans later but now the noctua fans are as good as anything else.
Motherboard, I didn't really choose it, for a specific reason. Actually I have neither the ram in the picture or in the part list in the computer, I have Kingston HyperX 2133mhz 16gb, I got 16gb because of the streaming and the video editing, and got 2133 instead of 1600 because they were the same price.
And I love the Samsung 840 pro, probably the best SSD out there, I my opinion.
And for the GPU, The old nvidia vs AMD, right now in this pricerange. I would say AMD wins. Only if you go for Ultra High End cards Like Titan and 690, But for the 7970 vs 680/670 I would go for 7970 anyday, but for this price range Amd wins my heart.
And the reason why i have 850 watts on my power supply is so i can add another 7970 if i want to. Maybe still could've went for a 750watt but If I'm gonna overclock a lot as well It's better safe than sorry.
The case i choose i wanted to try it out because I've heard a lot good about it, and I actually like it. It has a lot of good features and the 90degrees turn on the motherboard is interresting, But i really don't know if the temperture lowers so much, but I like the features. ( Also the reason why the NH-d14 is mouted like that, It's actually how it's supposed to be mounted atleasts in this case.
I have also fixed a cable routing and it's a lot better now.