ATX Case
Asus board that supports AMD Athlon below
AMD Athlon xp3000+ 333mhz FSB (without heatsink & fan)
Beefy Heatsink and Fan (Volcano/Antec - Get some decent paste!)
2X 512 DDR Corsair Ram (Match to FSB of CPU)
2 x IDE HDD - 160 Gig each
500 watt PSU
Plextor DVD writer
GFX Card of your choise
Soundcard of your choice
Loads of leads
Case Fans
Any networking cards you need

I picked that Cpu because it is a blinding good proccesor, and its cheap as hell.