Overclocking? Then aim high.

else, visit sweclockers forum and open a thread, or just cruise around, there are a lot of pros and cons with aiming high, but usually a i5 does whatever you need, and don't go for a BE if you wont tweak the voltage.

I personally will, WILL IN THE FUTURE WHEN IM NOT USING A MACBOOK, go for water-cooling. Much more effective.