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.