Thinking of purchasing this for my i5-3570k, trying to OC up to 4.5 Ghz stable. Is it a good cooler for the price? Since I have only ever owned a CM 212+, how good is it in comparison? The CM 212+ is on an old build and the current build is the i5-3570k. Also thinking of purchasing the IC7 Diamond thermal compound. In terms of fans, is the stock fan enough? Or would an AP-15 be good to put on it?