Sounds like a socket 478. PCI graphics? Was it a Dell?
A new mobo is a good start. If it is a socket 478, you can keep your DDR, as the mobo would have to use it. you might want to get more of it, though.
Staying with a PCI graphics card ain't a good idea, though. I can understand if you are just wanting to hold out for a while, but a full upgrade would be in order. But you have to crawl before you can run.
The selection of 478 mobos on NewEgg ain't that great. Let us know either which socket your CPU is, or what the make and model of the comp it came out of.
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