Gannet: Just to follow up on this issue. I finally got the opportunity to test ditching the Audigy and going with the motherboard sound. I have sound! So, the issue is with the Audigy.
Now I need to figure out how to get sound passthrough from a A8N5X to my 9800 GT? open to ideas on that one.
Many (but not all) newer generation NVidia cards have onboard SPDIF header pins so you can connect a cable from your motherboard to the video card.