To straight up answer your question... Yes your PSU will be plenty enough. Overclocking your CPU doesn't draw nearly enough power to soak up all of the 500w your PSU puts out. If your looking for a good water cooler at least buy the H80i. If your gonna go with the H60 you might as well go with a 50 dollar air cooler that will perform a fair amount better. Don't get the H60 just because it a "water cooler". I personally, would get a nice air cooler in the 50 dollar range. Just do some research or buy the one that I have just read below. I have a 4.7Ghz overclock and my temps are perfectly under control.