By manage I really just want something that is easy to navigate, handles playlists, removes duplicates, corrects artwork and info. For instance I really like Bonnie Prince Billy. His metadata is crap so his tunes download with loads of different varieties of his name. I manually correct them, but whenever I update iTunes they f-ing revert to the original listing. Which is arse-numbingly tedious.
Mostly I want one that doesn’t lose sodding random track though!