I would recommend a corsair H100i if you want the "best", or the cooler master 212 EVO if you want the best bang for the buck.
Haswell is really limited overclocking anyway - but it's extremely fast. You can almost for sure get to 4.3-4.4 with a cooler master 212 EVO, and possibly 4.6-4.8 with H100i, of course it depends on how good the particular chip you got is.