-The FX-8320 is a good step-up over the FX-6300/FX-6350. Since it's just a little bit extra, it's definitely worth the upgrade.
-The EVO will allow you to overclock, but the Noctua NH-D14 is one of the best air coolers out there and will allow you to overclock very well. Still, the Hyper 212 EVO...