Best cooler?

[varyation]

so i am looking for a cheap cooler for my radeon HD 6850 and thought i would ask what you guys would say is the best bit of kit to use? right now its getting 50c out of the stock when gaming but would like it to be a bit lower so i could possibly overclock it.

 

[alvine]

Zalman VF-3000 GPU Cooler
http://www.techpowerup.com/133386/ColorFire-Designs-Custom-Radeon-HD-6850-with-Zalman-VF-3000-GPU-Cooler.html