Zalman CNPS9900MAX would be a good one at a decent price and if in US a really good one with the rebate at newegg if you don't mind the red LED on the fan.
http://www.newegg.com/Product/Product.aspx?Item=N82E16835118075
They also have it with blue LE...
http://www.newegg.com/Product/Product.aspx?Item=N82E16835118075
They also have it with blue LE...