AMD Aftermarket Heatsink Fan Reliable & Affordable

The CM Hyper 212+ or Evo would be the best options for you...
http://www.newegg.com/Product/Product.aspx?Item=N82E16835103065
http://www.newegg.com/Product/Product.aspx?Item=N82E16835103099

These models are by far the most reliable and affordable ones that we have come across so far. You can check the reviews and you will really see that most people OC'ing their rigs on Air have chosen one of these 2 models.
The only factor that ought to govern your decision between the two options given to you is the height of these HSF. Just make sure the case you are using allows enough room for them.

http://www.coolermaster.com/product.php?product_id=3096
http://www.coolermaster.com/product.php?product_id=6741
http://www.coolermaster.in/product.php?product_id=6603