Songbird

Yes iTunes is the top used music player out there. But that is only because they advertise the iPod so much.  I really dislike the iPod, Its not an MP3 player! Every time you transfer music onto your iPod it converts it to a special iTunes format. I prefer real MP3 players that keep my music in MP3 format. Check out Sandisk Sansa players for a true MP3 Player.  To go with your real MP3 player Songbird is your real MP3 app that has all the features your looking for. You can create custom play-list, sort, sync with an MP3 player, installs on phones, purchase music, and more.

http://www.getsongbird.com/