What is a good aftermarket cpu cooler for my Intel Core i5-3570 Ivy Bridge 3.4GHz?

i would say the xigmatek dark knight II, similar to the 212 evo, but has a led fan, and the heatsink is ceramic coated which is nice and dissipates heat well and is only $10 more than the 212 evo
 

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Mar 31, 2013
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Actually, you won't need an aftermarket heat-sink for the i5-3570 unless you're overclocking it but it isn't a superb OC'er. However, the 3570K will need one (such as the Hyper 212 someone mentioned before) if it's overclocked past 4 GHz or so. Nonetheless, the best budget cooler (under $50) is the Hyper 212 Evo.