The H60 isn't that good of a cooler. I'm guessing here as I haven't personally used one, but I'd probably say sticking below 4.4Ghz@1.25v or so would be around where you're going to end up. I would have bought a hyper212+ with two kickin` fans and got excellent air performance that would probably exceed the capabilities of the H60 instead.
Well I think it's too late, I would stick with the H60, anyways how big is the Noctua NH-D14? Will it fit in a Sharkoon Vaya Value White?
And what OC I can get with the Noctua get with safe temps and voltage?