Solution
If you are only going to push the CPU to a 10% - 20% overclock, you can probably get away with using the stock cooler. For anything more than that you will need better cooling. Here are three under $50 heatsinks that are pretty popular:
Sunbeam
http://www.newegg.com/Product/Product.aspx?Item=N82E16835207004
Xigmatec Dark Knight
http://www.newegg.com/Product/Product.aspx?Item=N82E16835233029

I've added this one, because it is starting to get really popular:
COOLER MASTER Hyper 212 Plus
http://www.newegg.com/Product/Product.aspx?Item=N82E16835103065

They all require a somewhat different approach to applying thermal compound.
Suggestions for applying thermal compound...
If you are only going to push the CPU to a 10% - 20% overclock, you can probably get away with using the stock cooler. For anything more than that you will need better cooling. Here are three under $50 heatsinks that are pretty popular:
Sunbeam
http://www.newegg.com/Product/Product.aspx?Item=N82E16835207004
Xigmatec Dark Knight
http://www.newegg.com/Product/Product.aspx?Item=N82E16835233029

I've added this one, because it is starting to get really popular:
COOLER MASTER Hyper 212 Plus
http://www.newegg.com/Product/Product.aspx?Item=N82E16835103065

They all require a somewhat different approach to applying thermal compound.
Suggestions for applying thermal compound:
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=170&Itemid=1&limit=1&limitstart=5
 
Solution