I Run Farcry 3 On A Asus Gtx 680 DirectCU2 Top 2GB at 2560x1440p With A 3770K@4.6 Ultra Setting's No VSync Or Msaa And I Get 54-64 FPS With The Current 310.90 Driver's My Mate Run's A 7970 Ghz Edition And Get's Similiar Results At 48-60 FPS ! So I Would Say A 7970 Ghz Edition Would Suit You At A Decent Price/Performance Point !