Dude, $800, easily! Check this out..
PROCESSOR AMD Athlon™ 64 3200+
OPERATING SYSTEM Genuine Windows® XP Media Center Edition 2005 with re-installation CD
MEMORY 1GB Dual Channel DDR2 SDRAM at 533MHz- 2DIMMs
HARD DRIVE 160GB Serial ATA Hard Drive (7200RPM) w/DataBurst Cache™
OPTICAL DRIVE 48X CD-RW/ DVD Combo Drive
MONITORS 17 inch E177FP Analog Flat Panel
VIDEO CARD 256MB NVIDIA Geforce 7300LE TurboCache
SOUND CARD Integrated 7.1 Channel Audio
And, that is $689, with monitor, AND OS. Plus, you could downgrade a couple of things if you wanted..
Edit, I did configure a good system, but the link expires when you exit..but with all that stuff, it was $689. Including monitor, AND OS!