New VGA for RO2

Hi guys, I've bought the game so I would really like to be part of the troop but, in order to proceed, I have to upgrade my pc. In these circumstances, I need a brand new graphics card. Here is my config:

AMD Athlon 64 X2 5000+

M2N-MX SE Plus

2GB RAM

19'' Monitor (1440x900)

600W PSU



What would you recommend?





Thanks in advance for any help you can provide.