One of these - AMD Phenom™ 9850 Black Edition CPU.
Overclock on this - Asus M3A32-MVP Deluxe Motherboard.
Oh, and two or three of these - 2GB (2x1GB) Corsair TwinX DDR2 XMS2 Dominator RAM.
Together with this - Asus Xonar D2 Ultra Fidelity 7.1 PCI Sound Card.
One of these - 1000W Enermax EG1000EWLDXX V2 Galaxy Modular PSU.
And this when available - ATI Radeon 4870 HD Graphics Card.
All you need with this is the CD drives, NIC card, Hard Drives and a sweet case to put it all in.