Excellent point, Mr. nova.
A sound card that only runs AIFF (16 bits, 44.2/stereo) might be a good investment.
I'd have to look at the software options, though. I used to run a product called CD Sound Doctor II (who was their marketing genius, anyway?) and successfully AIFFed about a thousand (!) rare tracks from vinyl. The project was time-consuming, but the results were great. That software product is no longer supported, and I gave away the boat-anchor Power Mac that ran it.