Need Advice on what GPU to buy


Sep 11, 2011
Im upgrading a Gt430 Graphics card that i have and im just confused to hell as what to buy.
To begin with my Resolution is 1440x900
System specs
Amd phen 955
500d earthwatts antec
785gt msi mobo

The mobo allows CF

Should i get the Sapphire Radeon 6850 or a EVGA GTX460?

is Sapphire a reliable company like EVGA?

Ive never bought AMD graphics so i dont which are the trusted companies. i know that hd5770 is good enough for my res but i want one of those two aforementioned cards so i can play bf3.