Can i upgrade the video card on a Dell Inspiron 530 slimline?

Dell doesn't give you the option of upgrading the video card at the time of purchase and I want to make sure that I can do it later. Otherwise my World of Warcraft will not work properly. Or so they say :)|||Yes, but you can only use low profile video cards, which are more expensive and underpowered. But it should be fine for WoW.