I've sampled vinyl with several cards : a Gravis Ultrasound (anyone remember that one ?), a Soundblaster Live and a Soundblaster Audigy. I can't hear any difference in sampling quality of tracks that were made with the oldest card (Gravis) and the newest card (Audigy)
So my guess is, as long as you use a decent soundcard (not AC '97), the quality will be more than adequate.
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup