Choice of cooler depends on the levels of punishment you can expect. If you plan on pushing that fx close to 5GHz, you'll need something respectively beefy, if you plan on not going that hard core, you could go with something smaller. With 168mm of cooler clearance in the case, you'll not be limited by pretty much any choice.
Personally, I'd go with the biggest cooler you can justify budget for, you can't overcool a cpu, and having the extra capacity you'll not be restricted by temps no matter what you choose to do. A heavy video render using all 6 cores at close to 100% loads is gonna get warm, no matter what the OC, so plan accordingly.