I like my Antec Kuhler 920, keeps my 8120 @ 4.0 under full load 45C (i could keep it lower but thats what i have it set to never exceed 45c and it has no problems nor does it sound like a jet engine taking off)
http://www.newegg.com/Product/Product.aspx?Item=N82E16835209054
Or looking into it antec makes another i believe its newer because i didn't see this one when i bought mine but worth checking out since its around the same price:
http://www.newegg.com/Product/Product.aspx?Item=N82E16835209080