Analog to digital interface

I'm seeking the best way to transfer some of my vinyl to my music drive while preserving the quality of the recordings in the best way. I'm running my tt through a Magnum Cronus 2 which has fixed and variable outputs (RCA) but I'm looking for an interface to a USB port on the laptop that I'm using for a server...hopefully by the least complicated path and with the best bang for the buck....Suggestions?