i'm contemplating re-ripping my CDs onto the duo. basically, the last time i ripped them, i set it for wma @ 48Kbps because i didn't have the option to rip them to MP3s at that time and i wanted to fit them on 2G memory card/stick for my PSP.

meh, i don't even know how many CDs i have. anybody want to explain the different formats? i'm not really worried about syncing them with anything, just want a decent size to noise ratio.

my choices are:
Windows Media Audio
Windows Media Audio Pro
Windows Media Audio (Variable Bit Rate)
Windows Media Audio Lossless
MP3
WAV (Lossless) - no way.