Oops, forgot to answer the format question. Yes, if you want optomal quality, then you should rip your CDs to either WAV (space hog) or another lossless format like FLAC. FLAC still takes a lot of space, but not as much as WAV and has the same excellent quality. That said, the higher bitrate MP3 files, as in those >192kpbs should still sound fine for casual listening.