i have this pc http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00748726&lc=en&dlc=en&cc=us&lang=en&product=3230688 with a 450 power supply and i was wondering wat video card can i upgrade that will let me run 2 monitors. a 40 inch sony 1080p at 60 fps and a dell 1024x768..thanks