The Cooler Master Hyper 212 is a good cooler on the lower end of the spectrum: http://www.newegg.co...N82E16835103065
That should get you to 4+ without a problem, probably 4.2 without a problem if you don't have a boiling hot room like I do.
If you wanted to do more serious OCing, then the Corsair one-piece liquid coolers are the way to go for all sorts of reasons. Those start with the H50: http://www.newegg.co...N82E16835181010 (not the $300 bank-breakers liquid coolers used to be as you can see)
Our website's listed in the Community Portal, but it's here: http://www.kitsunesys.com/
I will *try* to have a writeup on de-lidding the 3570k by Tuesday, but otherwise others have already done some good stuff on it. The video I like most is this:
Edited by Catamount, 29 March 2013 - 03:19 PM.