WHat I paid

2x 5970 for $750 (used)

2x 5870 for $350 (used)

3x 5850 for $345 (these were new)

Thats about 3.4gh for $1445 for the cards

I spent another 150-200 per rig.

$50 foxconn mobo (currently running 4 cards)
$30 cpu
$180 Thermaltake 1200w power supply
and whatever 1gb of ram costs.

Good deals are out there!