A passing thought, with a dash of devil's advocacy:
You're buying a new PC setup for the transfer of analogue material to a high standard. Assuming you can obtain a high quality ADC with firewire or USB interface and the PC has sufficient processing power, why would you need a soundcard at all?
Will
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It would seem that most new PC's get their sound capability directly off the mother board, so mostly you don't need to buy a sound card when you buy your computer, if all you want is noise. This may explain why the sound card inventory of places like Best Buy and CompUSA is very poor.
-- Frank B Strauss, DMD