Upgrade - What next?


Jun 18, 2009
Hello everyone, I am looking for some input on what I should upgrade next on my system. It's a former server computer that I've worked into a light gaming system:

1 3.4 Ghz Xeon Processor
3 GB PC2-3200 ECC RAM
1 48X CD-R/DVD Drive
1 256 MB NVidia Quadro FX3400 Graphics Card
2 80GB Hard Drive 7200RPM
Windows XP Pro SP3

I think that's all of the "vitals" - if you need more info, please let me know!

I have room for one more processor, and I can have up to 6GB of RAM total. I'm really looking for "bang for my buck", but where should I go now? thanks!