What is the best option *fixed*

What is the best upgrade from 275 gtx

BUDGET: 120$ (I dont care if its used or manufacturer refurbished)
CPU: phenom II 3.1 black edition
2gb ram (upgrading)
530 w raidmax 80plus

Im not planing to OC. I want to run battlefield 3 high or ultra settings in multiplayer (I know 275gtx can do this job but I want to have a directx11 card)

my monitor resolution is 1280 x 1024 > maybe upgrading it to a 19´ inches plasma

and I dont care if its ATI or Nvidia