Which card to buy?

I was wondering which card I should pick up. Asus Radeon850XT PE or a Sapphire Radeon X850XT.  Here are the links:
http://www.newegg.com/Product/Product.asp?Item=N82E16814102526 - sapphire
http://www.newegg.com/Product/Product.asp?Item=N82E16814121541 - asus

Ive heard that Sapphire cards are one of the best for overclockers, but this asus card is clocked a bit higher.  I havent heard much about asus cards so I dont know if they are as o/c able or stable under stress as sapphire cards.  If anyone has either of these or can vouch for them, help me pick one.  Thanks.

I don't think this will help too much, but I've mounted a few Asus' motherboards and they looked sub-par compared to MSI.