...with an ASRock 970 Extreme 3, that and the Phenom X4 965, cooled with a Cooler Master Hyper 212 Plus, what kind of OC do you think I might be able to achieve?
There is no way to know for sure what over-clock anyone can achieve, every CPU has a different over-clock ceiling. There are other variables to factor in as well; room temperature, case design, cooling methods, thermal compound application, and over-clock methods. Using the Hyper 212 Plus will help very little if you have poor case ventilation or hot room temperatures.