Best 200mm ball bearing fan

[Zooman580]

I need to install a 200mm fan exhaust on the top of my case, but can't find a ball bearing fan. I heard taht sleeve bearing cannot be put in a horizontal position w/o wearing out quickly. Is that true?

 

[davcon]

http://store.antec.com/Product/cooling-cooling_fan/big-boy-200/0-761345-75200-8.aspx