Hello,I recently bought world of warcraft cataclysm. However, due to my graphics card I have to have all the settings on very low. Does anyone know the best graphics card for the computer without having to change the powe input or anything, just the card? Also, it needs to be capable of "shader 3", not sure what that means. I have an ADVENT SQ9204, with 4gb RAM and a 300gb hardrive, with over 100gb left. I know absolutely nothing about computers so anything would help