There are a few things I can see. First is ram, see if your mobo with allow 800 mhz for the ram and from 4 to 8 gigs, should see a significant performance increase. Second is your psu, go modular with a minimum of 750 watts. Great for cable management. Third is HD, definitely go to an SSD and load you OS on that, maximum performance increase. Fourth, if you wanted to, go to a quad core cpu. Then with the new parts in, get you a good cheap mobo, case and build a rig with you left over parts and sell it to recoup some of your money. If you play your cards right you might come out in the plus column in the end. Win win for everybody.