Memory Upgrade - Possibly More?

Hi guys,

I built my first (gaming pc) about three years ago and ive been very happy with everything so far.

I've looked at the recommended system requirements for Far Cry 3 and i was thinking it might be time for a slight upgrade.

Heres my current specs:

CPU: Phenom II X4 965 BE
MoBo: Asus M4A79XTD EVO
GPU: Saphire HD 5870
Memory: Xms DDR3 2x2GB 1600 cl7 Corsair RAM
PSU: 750w Corsair XT
Windows 7, 64bit

I was thinking the RAM needs an upgrade and then probably the graphics card. Any suggestions for a speficic graphics card?

Also any other upgrade recommendations other GPU or Ram would be appreciated

All feedback is appreciated. Thanks.