Video card and Power Supply Question on emachines?

I have a emahcines with a 250w power supply computer here: http://www.bestbuy.com/site/olspage.jsp?skuId=9999111700050017&st=emachines&lp=4&type=product&cp=1&id=pcmprd111800050017



and i was wondering what good 512mb video card could i get without upgrading or changing the power supply. maybe a video card that could run cod4 and crysis no problem.



Thank you very much|||According to the specs for that system at BestBuy, your Emachines has an available PCIExpress 16x slot for graphics cards.



For a 250-watt power supply, I recommend sticking with a graphics card that draws under 75 watts of electrical power. That means either the nVidia 9500GT or the ATI Radeon HD4670.



Hope this helps.