i have gigabyte G31 M-S2L motherboard with intel core 2 duo 2.8 Ghz processer with 2Gb DDR 2 ram and 320 Gb HDD i'm planing to buy a mid-range graphic card which can run games like gta 4,nfs shift,f.e.a.r,fallout etc which graphic card should i buy plz help plz show me all the range of graphic card that can run gta 4.