I think you should work with Cooler Master, and send them this Seidon back to see if anything's wrong with it. On paper, it should be enough for your 6700k, unless you're overclocking the living balls off it. I would say, get an air cooler like a Cryorig H7 or Hyper212 and just leave it at that. If you want a liquid cooler, I'd get the h100i GTX and replace the fans with something better, like EK Vardars or Gentle Typhoons. 280mm radiator AIO's like the h110 have better surface area, but good 140mm fans are harder to come by, and the Corsairs aren't exactly good. They're decent for temps, but they're damn loud.