I would go with the NH-U14s. I just picked one up and it keeps my 2700k really cool with both fans running at 600rpms. Ran IntelBurn and the cpu stayed right around 49c-51c. I have the fans set to ramp up if the cpu gets to 60c, and It hasn't ramped up since I've had it. (Almost two weeks) I have turbo enabled in the BIOS, so the cpu was clocked at 3.9GHz while running IntelBurn.
Note: I'm not knocking the Thermalright cooler, because I've never used it.