m4a

Maybe this is my own bullheadedness at work, but does anyone know of a good convertor to switch your iTunes downloaded m4a files to mp3, please let me know. I've got every CD I own encoded as 192kbps mp3 and they play fine in winamp, sound fine when burned as a mix, and work fine for me.. I'd rather not have to load up iTunes everytime I wanna hear a song I actually took the time to purchase (i.e. the new Modest Mouse).