If anything you may wanna wait for the release of Piledriver based AMD Athlons. The Athlons are a trusted budget CPU that are good for gaming, multimedia, everyday use, and they come in quad core packages so gaming performance on them is pretty decent. Some, like the expected 750K can be overclocked. But this processor has yet to be released yet, but upon release, it's expected to be around/under 100$.
If your budget is that high definetly go intel. The closest AMD processor to the i5 3570k is the FX 8350 and the single thread performance (the most importiant part for gaming) isnt as good as Intel. Granted, there is something inherently cool about overclocking your 8 core AMD CPU to 5ghz but from a purely gaming standpoint Intel wins. (For now)