there's pci express cards that can support 4 monitors in dvi
i would never trade a pci-express card for a pci card
if you can't afford a new pci-express card that can handle two monitors, just get a pci card for the 2nd monitor, and leave your primary monitor hooked up to the pci-express card you already have.
99% of games are only going to support one monitor, anyways, so you may as well keep at least the one decent card (not that the one you have is really 'recent' but it's better than PCI)