As far as I know, all ATI and Nvidia cards with a VGA and DVI connector can use both at the same time.

The ATI Fire GL4 has dual DVI outputs and costs $1700.00
Newegg has it "refurbished" for $500.00. Seems like a great deal, but you probably don't need such a crazy video card.
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-Rob Riccardelli
80GB 16MB MK2 090000736