Will you be doing any overclocking?
I heard AMD chips get pretty toasty when OC'd.
I'd personally recommend this:http://www.newegg.com/Product/Product.aspx?Item=N82E16835106150
Fantastic air cooler and more or less silent when the fans are turned down. Comes with a second fan for a push/pull config. Not very pricey and will last you a while.
Keeps my i5 2500k under 65C OC'd to 4.5ghz under load on prime for 8 hours. Rock solid when installed. looks pretty sweet to