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If you're only looking to do gaming with it then an i7 is a waste of money, especially the 2011 socket ones. An i5 3570(k) would be your best bet. If you're gonna get into video editing and other heavy/intensive apps then an i7 is worth your money. From what I've heard, both of those i7s are very good.

Anyways, an i5 would be the obvious option a year ago, but now that games are starting to be optimized for more than 2 cores, the i7-3770K seems more logical and is designed to be overclocked 