Nice machine!
$2400 in video cards
$1700 monitor
$300 sound card
$1400 CPU (based on the 3.2Ghz price)
$900 in hard disks
$250 in ram
$250 motherboard (based on the one quad PCIe x16 MB I found)
For a total of $7200 from NewEgg.com, and that doesn't include the other stuff not listed...