Audacity, which is free and easy-to-use, would also work very well for running from your preamp directly into the Mac.
Vinyl to Digital: Software or USB Converter?
I'd like to digitize my vinyl to play via AIFF. The options are a) to use a phono preamp which outputs USB, or b) to run the preamp output directly into the Mac's audio input and digitize it with Roxio Spin Doctor. Any recommendations on which would produce higher quality recordings? If you recommend the software route, any suggestions besides Spin Doctor?