Here's a PC Part Picker That I created For you, runs most games at 60fps Ultra.
You can exchange the card if you would rather have different setttings. (GTX960/R9 380)
And you can change out the processor for 4690k instead of the 6660k
16GB Ram really isn't needed, and 2TB Hard drive should be solid for everything, add an SSD if you would like!
This is a build i would buy and you can change case for other cases just personal preference for me.
http://pcpartpicker.com/p/3XTXK8
NO OS SO I RECOMMEND YOU TO GET IT ON TO A BOOTABLE USB DRIVE TO SAVE 100$