Cheap motherboard. Take a look at yours
Look around the CPU socket(where the CPU goes).
Now another board
Notice the black things surrounding the cooler?
Not only does the CPU and GPU get too warm. So too do other components. Some boards come with those passive heatsinks to help keep components cooler which equates to a "healthier" computer. Just an FYI. If in the future you wonder why is my motherboard so much warmer than my CPU you will know why. Not saying you need a Z170 board. You know you don't need it for OC'ing.
Good PSU.
Good case. I'd prefer
https://www.newegg.com/Product/Product.aspx?Item=N82E16811853002 for a budget case.
Then I'd toss in the Cryorig H7.
Never head of Galax. http://thepcenthusiast.com/galax-geforce-gtx-1080-hof-8gb-review/10/ Seems good.
165 MHz at 2560x1440 aka 1440p with those two games? Seems likely.