C'mon you really think your computer couldn't use an nVidia card?? Man I though you were smarter than that! Well, I'd just save the money. Seriously, I'd upgrade the whole computer. Like, get an AMD 64, PCI-E motherboard, and a 6800GS or x800 or x850. Just save it, no point in buying something for your current computer.
Well, its just that it came with Ati, and i thought my mobo was kinda i dont know, prone to Ati. But i do have Pci EX. Anyways. im Ati biased anyways.. Hell i dont know why.