If you are not overclocking, then 60C is OK. Make sure the case is well-ventilated. ANy cooler on the CPU will necessitate you work on the motherbaord - unless you have a backboard with a cut-out, that means you may have to remove the motherboard.
Many people (most?) here recommend the $30 Evo Hyper 212 cooler. I prefer a low-end closed-loop liquid cooling. It's quieter and the radiator/fan vents the hot air out of the case.