Whats the best cpu cooler for a i5 4570?

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Onesliceofham - Evo is standart, mainly for non-OC processors like Yours, and it's a great AF choice. In that price, there's Cooler Master Seidon 120V, with slightly better cooling performance, but a lot of noise, a it's really a piece of crap, so not an option. But since You asked, there's still that one.
 

RazerZ

Judicious
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The 212 EVO is commonly seen among budget overclocking builds as well, it's a good cooler for the price. If you wanted something cheaper that would still be a good improvement over the stock cooler you could consider the TX3:

PCPartPicker part list / Price breakdown by merchant

CPU Cooler: Cooler Master Hyper TX3 54.8 CFM Sleeve Bearing CPU Cooler ($17.98 @ OutletPC)
Total: $17.98
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-11-28 10:27 EST-0500
 
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