Actually if you would like to upgrade your box, from newegg you can get:
A dual core e2140 (basically a core 2 with less cache) – http://www.newegg.com/Product/Product.asp?…N82E16819116037
ASRock 775 Motherboard with PCI Express but still uses your DDR RAM – http://www.newegg.com/Product/Product.asp?…N82E16813157114
and an HIS x1650 pro 256mb – http://www.newegg.com/Product/Product.asp?…N82E16814161037
for $200.80 shipped – $20 Mail-In-Rebate = $180.80 Shipped to your door (or in your case, the WCU mailroom)
and honestly that was just with a quick search; there are some great deals out there if you look around.