If you can get an i5 3570k, that will allow you to be able to overclock once you have a good aftermarket cpu cooler. You could get an i7 3770k as well. Else any i5 or i7 from the 3rd gen would work with that motherboard. You need a k cpu to overlock on that motherboard.
i5 3570k with a decent cooler would be your best bet.