2 Video Cards with 3 Monitors
 

I have 2 monitors now and I want to add another one. I have a GTX 260 video card, but I only have one PCI Express slot so I need a PCI video card. I had an older PCI 5200 Geforce card but that doesn't work....just crashes my system with incompatible drivers. What PCI video card will work in my system?

Thanks

Edit: I just checked Nvidia drivers and it seems like the 8 series cards use the same driver as my GTX 260....so would one of the 8400 pci cards work?

Thanks