Lets face it when your going to spend that amount of money on a build your going to want to take care of it specially if you want to overclock, you're going to need good air flow in your case and a cpu cooler none of the builds which ive seen have either of these components, and what happened to the keyboard and mouse?
Also for gaming an i7 4790k isnt necessary, the multithreaded cores contribute to heat production which is bad for lifespan. Im not saying the i7 is bad cause its not it an absolute beast however the i5 4690k is literally the same cpu except it doesn't have multithreaded core which could benefit you, less heat=more life and you could even overclock it to higher frequencies. As far as the gtx 970 I dont recommend them lots of people have been having issues with them, and in light of it hardware limitations and nvidia false advertisement, i'd say stay away from those; also for the price of 2 gtx 970's you could get an amd 295x2 which is the best thing for gaming right now actually its overkill for literally any task you throw at it and its at an all time low for 600 something dollars.
I'm going to submit a build, let me know what you think?
http://pcpartpicker.com/p/D2jkmG
This build has it all, I selected the fractal design r4 because its a nice case and it comes with two fans included it also aid in noise reduction. The build also includes a high end air cooler for the cpu, one more fan for better air flow in your case;it also has more ram
and it even come with a mouse and keyboard at your budget.
I apologize for the length of this submission but i really wanted recommend you an epic build, the amd r9 295x2 was made to compete with the titan it will definitely outperform the gtx 970 sli configuration not to mention you wont run into any sli or crossfire issues since the build only has one gpu and it comes with a closed loop liquid cooling setup to keep things nice and chilly