I have an asus CG1330 essentio series, its all stock from the store. (full list of specs here http://www.asus.com/Desktop/Gaming/Essentio_CG1330/#specifications) and ive been looking to upgrade it for a while now. I mainly just want to upgrade the graphics card. I'm new with hardware on computers so im just wondering, whats a good upgrade that is not going to require me to add anything else but the graphics card? I mainly just dont know much about graphics cards in general, so what should i look for in a card?