I can't believe that it seems to be impossible to upgrade the graphics card in my G5 quad without having to buy a whole new system!! I just bought a 30" Apple Cinema display and it looks GREAT!! But in order to really get it useable under aperture, I need to upgrade the graphics card to a Nvidia 7800 or a Quadro. I can get either of these as an upgrade option when I order a G5 but I can't seem to find them anywhere as stand alone products. Anyone out there found these anywhere?