Why don't you go to the website of a computer dealer in your area, they should have a link to custom build your PC and get the bottom price.
First you start with the motherboard, here is what I would suggest:
ASUS P5G-D2 motherboard
1024MB DDR-2 533Mhz RAM
Maxtor 200GB 7200RPM 8MB ATA133 hard disk
Sapphire Radeon X600PRO 256MB PCI-X video card
19" BenQ FP931D LCD 1280x1024 .25MS .29 Blk/Sil
LG - Combo CDRW/DVD 52x 32x 52x + 16x DVD
Pioneer 109 16x DVD±RW 4X± DL DVD burner
Logitech MX1000 Cordless Mouse Fast RF-MX Laser
Microsoft Wireless Optical Desktop Pro 2.0 Keyboard
Raidmax Cobra Mid Tower Case 420W
Enermax - EG465P-VE 430 Watt ATX Creative Labs Sound Blaster Audigy 2 ZS - Retail Box sound card
Logitech X-620 6.1 speakers
Software: Windows XP Pro SP2, Nero, Norton A/V, Pinnacle Express, ,,,,free software {DVDShrink, VLC media player, Adobe Acrobat Reader and all other goodies others may suggest.