What is a good enough gaming CPU for World of Warcraft?

I was apparently lied to by Blizzard, whose advertising materials state that the minimum spec for playing World of Warcraft is currently an Intel i5-760 and an nVidia 560 Ti. Coincidentally, this is EXACTLY what my old gaming rig has. And I thought, great! I can play WoW! Fantastic! This rig

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World of Warcraft system requirements

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