HDtracks Music Libary Software For Macs

For casual listening I am currently using iTunes (on an iMac) and a WiFi Squeezebox Duet feeding, via analog output from the Squeezebox, a Pioneer Elite receiver. I want to upgrade the system to HD audio via adding a Squeezebox Touch. I know that iTunes will not handle HD audio files (anything above 16/44) and need alternative software to handle the music library. HDTracks recommend; Amara, Pure Music or Decibel software for Mac. Which one do you use and why?

Marcus