Firstly if you want to get a graphics card i would spend at least £40 to £50 or $65 to $70 on buying a good power supply like a 500w or 600w 80 PLUS Bronze certified power supply, check eBay for some offers. once you have a better power supply all you have to do is ask yourself how much you are willing to spend on a great graphics card. If you want to play new fps games or just mmorpgs