Air Cooling

So I plan on oc-ing my FX-8320to 4.0ghz, and I was wondering which cpu heatsink, in the up-to-$50 price range, is the best to use in this situation? Also I was planning to use a Xigmatek Blackknight 2 Nightwing.

--Thanks.

p.s. The colour scheme in my case is back and blue with no LEDs, yet this is not a big deal just a thought to consider.

 

don't use the original blackhawk, use the blackhawk II with the ceramic coating

and that should get you around 4.5Ghz