Best single slot low profile card?

[Audax]

Whats the best single slot low profile card for gaming?

 

[purple stain]

Their is also the 6770/5770

5770
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150566

6770

http://www.newegg.com/Product/Product.aspx?Item=N82E16814131445

The 6850 is the absolute fastest card as a single slot version but as greghome pointed out it's quite an unreasonable price.Although it is the only 6850 that can do quad crossfire.At a more reasonable price the single slot 6770 is the better choice over the 6670.

What are your full system specs?(CPU,RAM,etc.)

What is the make/model of your PSU?