i am currently Overclocking an E2180 with stock HSF & compound
i got to 2.75Ghz with stock voltage, temps were 59C max
im currently at 3.00Ghz with vcor at 1.41 no load, 1.39 under load. Temps at 64C could go to 65 if i need to push the vcor a tiny bit more to be stable.
Seems ok with stock HSF & paste. If you wanna shave a few degrees spend the extra 5 bucks on some artic silver or metal compound. or lap your stock HSF for additional contact.
Either way a few bucks can improve your temps, but as I said doesnt look necessary.
Post how the OC goes!