"Zip + Rockbox = Audiophile Nirvana"5.0 starson by ultrabike
Pros: Same Clip+ audio chip (http://nwavguy.blogspot.com/2011/02/sansa-clip-measured.html)
Rockbox Super FW: http://www.rockbox.org/wiki/SansaClip (games)
Audio Format support: http://en.wikipedia.org/wiki/SanDisk_Sansa
Seemless support for 32GB microSD
Cons: It can get stuck. Press the top bottom and hold for > 10s and the system will reset (audio files will not be deleted)
Summary: Incredible bargain as a dedicated portable audio device.