First of all, that is NOT an overclocking motherboard. The mosfets have NO heatsinking and go under quite a lot of stress on an overclocked processor. I recommend buying a mosfet heatsinking or directing your attention to a proper overclocking motherboard. Some nice mosfet heatsinks I thought of off the top of my head ; MOS-C1's or thermalright hr-09 (note the HR-09 probably won't work with a big fan, better with a water pump system. Another point ; they can be tricky to install. Look up videos before pulling the trigger and make sure you wanna go through with it.
Second of all, CPU cooler ; CRYORIG H7 is probably one of if not the best sub $40 option in USD.