If anyone cares at this point......

The links at the Quantex Zone came back to life earlier this month and I was able to get the files there. My sound pops a bit at boot-up, but is good otherwise.

The Turtle Beach upgrade discount is $15 off a Santa Cruz card by phone order only (knocking the price down from $79.95 to $64.95 plus S&H). An OK deal, but not great.
I can hang on to my present card until I really feel I need to upgrade.

Thanks again for everyone's help and suggestions (both of you! ).