Mobo 
ASUS P5VD2-VM SE LGA 775 VIA P4M900 Micro ATX Intel Motherboard - Retail $47

PSU
Rosewill RP550-2 ATX12V v2.01 550W Power Supply - Retail $52

HD
Western Digital Caviar SE WD3200JBRTL 320GB 7200 RPM IDE Ultra ATA100 Hard Drive - Retail $90

DVD
PLEXTOR 18X DVD±R Super Multi DVD Burner Black SATA Model PX-810SA/SW-BL - Retail $74