Well, from my experiences with an i5 3570k, try to keep frequency at 4.5ghz or under: anything above is unnecessarily overkill. (For most people, any OC is overkill :P) You should be able to get 4.5 with 1.2-1.25 vcore. My chip is able to hit 4.5 on 1.2v, LLC at 50%.
My recomendation to start is 4.5 ghz, 1.18v. Prime95 for at least 6 hours, and keep bumping voltage untill you're stable. After you're stable 6 hours, restart, turn up all fans to max, and get a 12 hour blend test. If it passes that with max temps under 80, you should be golden. With your cooler, shouldn't have issues. Good luck, and enjoy it!