so what you need is a motherboard, CPU, video card, RAM, hard drive, CD/DVD drive, PSU?
motherboard: MSI K8N Neo4-F
CPU: AMD Athlon 64 at least 3500+
video card: at least Nvidia 6800 GS
RAM: at least 2x512MB PC3200 from OCZ or G.Skill
I didn't spend much time on that as you can see, but it's late here. I might help more tomorrow.