I'm looking g at a few coolers for the 8600k, and would be looking to do a small OC of about 4.8Ghz
The main coolers I'm looking at are the Corsair h80i v2, or the CM Seidon 240V.
The other options are some low profile, top facing coolers. I've seen the Cryorig C1 or the Big Shuriken 2 Rev.B...