Does anyone know if the new iMac's graphics card is welded in like in the original one? The only thing that is keeping me from buying the new 17 inch model right now is my fear that I won't be able to run some high end games (like UT 2003). I've done manual work with computers before, like putting in more RAM and a new Hard Drive. Does anyone know if I can upgrade the new iMac's graphics card?