I hope you didnt buy your mobo expecting it to be "future proof"? to run PCIe, you'll need a new mobo. But for now, that doesnt worth it. I'd stick with your current board for a while and let the PCIe technology become more current. People buy PCIe now to have their system future proof, but as I learned over the time, first generation are not always that future proof, as new feature and performance will be tweaked in the next generation of board.
I wait for better improvement in performance and better available hardware before making the switch
-Always put the blame on you first, then on the hardware !!!