I have a question about video card compatibility...?

I have a Compaq Presario SR1111NX, and I want to change the video card. Which, if any, are best for my pc? I have a game that calls for an ATI 9700 Pro, or nVidia 6600. Other recomendations include the ATI X1600 or nVidia 6800 GT/GS. Are any of these compatible? If not: which do you guys recommend?|||Looks like your motherboard has a PCI video slot and the ATI 9700 requires an AGP slot. I would upgrade that motherboard to at least a board with an agp if not pci-e.|||for compaq ati are much better