Hola. I am new to Apple, first powerbook last April and I want a new PowerMac, but I hate Apple's selection of video cards. Either the absolute low or the absolute high. I do not want a 6600LE or 6600 even, nor do I want a 7800GT or Quadro 4500.. Plus the 7800GT isn't an option at the Apple Store, even though it states on the apple.com that 7800GT is a video option upgrade.... My question, is it possible to just buy any PCI-e video card and use with a PowerMac? I was thinking of nvidia 6600GT or 6800GT or ATI X800 or X850.. thanks!