Well I think I have found the answer to my own question, for future reference to others who might have the same question. The wisdom in changing to the PCI-Express system on the last revision of a product line that was discontinued by switching to a completely different processor seems a little flawed. As one would reason this cuts down on available options for those slots greatly.
The only GPU that I found from ATI for these machines is the ATI 100435854 Radeon X1900 G5 Mac Edition Video Card. $299 from Newegg.
Supposedly according to the ATI sales rep the card does support Versavision which would allow a monitor to be used in portrait mode.
I will try to report back once I get the card in my box.
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