I'm running a similar build to yours. I have the I5-6600K, liquid cooled with a Swiftech AIO, pushing out the top of my case too. At idle, I see temps down as low as the teens, with temps under load coming up to about 65C.
The UEFI in your motherboard is almost exactly the same as mine and I love it. It's super simple to use and easy to find all your settings. I had never overclocked prior to this build, and I had it figured out in about 5 minutes. The ASUS utilities are quite useful and make it pretty painless to set up your system as you wish.