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Thermalright True heatsink
http://www.heatsinkfactory.com/thermalright-true-copper-ultra-120-extreme-cpu-cooler.html

120mm fan with 100+CFM will work with most good air coolers like the True for up to 4ghz. Total cost would only be about $120.

If you want to mess around with WC instead, that's your call. Just know you're getting into beforehand. Much higher cost, more time to install/set up, lower margin for error. Plenty of options at the link above if you go that route.