Does your motherboard support PCI-Express or AGP?

If the former, something like this:

http://www.bfgtech.com/7950GT_512_PCIX.html
or
http://www.bfgtech.com/7950Gx2_1G_PCIX.html

if AGP, then:

http://www.bfgtech.com/7600GS_512.html

(This is, of course, taking you at your word that money is no object. Of course, there's also:

http://www.bfgtech.com/8800GTX_768_PCIe.html

But I tend to try and stay one generation back from the top of the line.)

I've bought several video cards from BFG, and they've all been exceptional.