Hi, I would like your opition on what type of air cpu cooler to use with i7 6700k with GA-Z170X-Gaming 7 motherboard and corsair 100r case.
I run an i5 6600 with stock Intel cooler, which I find ample, as I am not overclocking. Don't forget Intel design their coolers for the processor they are intended for, so in the main, the Intel fans are best. However if you want to over clock or your case is so bad it heats up too fast, then the problem is not with your CPU cooler. The best way for extreme heat is a liquid cooled system.
Look at the Raijintek Triton 240mm AIO Water Cooling Solution, for price it is quite decent and cheaper than many direct air cooled heatsinks.