well your config is just fine, except that ur mobo is based on nforce3 chipset. the nforce4 is already out with boards from gigabyte etc. try that.
you would then hav to change your gfx card to a PCIe based card. but trust me, paying a little extra for future proofing is good investment
plus with the nforce 4 boards u can go in for dual channel ram which will boost effective performance to 1gb of ram!!! well thats the theory anyway!