I recently upgraded my trading rig and have the following for sale:
2 each, Matrox G450 dualhead AGP cards (one for spare)
and 2 ATI Xpert128 PCI cards.
Your mobo must be AGP, with 2 PCI slots available.
This is for VGA display, only. Max resolution in 4-monitor rig setup is 1280x1024... which is perfect for 17" or 19" LCD.
Display is very sharp... guaranteed to work in Windows XP. I'll help guide you in the installation, if necessary.
$75, shipping included.