I have finally completed the building of my computer. I now have two computers, hopefully they're both good enough to run for about 3 years ahead. Here's the current set up for both computers. i intend to make the older computer fully DirectX 9.0c compatible in the future.

Athlon 64 rig:
AMD Athlon 64 3000+ Winchester
MSI K8N Neo2 Platinum
2 x 512MB Apacer DDR400 CL2.5 RAM (running 2.5-3-3-6)
Galaxy Geforce 6600GT 2.0ns
Creative Audigy 2 ZS
iomega CDRW 24x10x40x
Pioneer DVR109

Pentium 4 rig:
Intel Pentium 4 1.7GHz Williamette
MSI 645 Ultra
1 x 512MB DDR333 + 2 x 256 MB Apacer DDR266 RAM
Ennyah Geforce MX4000
Creative Live DE 5.1
imation CDRW 52x24x52x

What do you think? I think it's not bad.