I was just looking on Newegg for your required components, and I found this card:
http://www.newegg.com/Product/Product.asp?Item=N82E16814150089
I think that is one of the cheapest dual monitor cards around, and it's AGP which will run faster than the PCI card. I know you said that you wanted a PCI, but you'd end up spending the same amount of money on two "lesser" PCI cards.
As regards your PSU, I think this one should be fine:
http://www.newegg.com/Product/Product.asp?Item=N82E16817103935
But I'm not sure what else you will be running off the PSU, so you might need to get more wattage from a different PSU.
Hope this helps!