I was in the same boat as you about 5 years ago - I had been stubbornly using iTunes, but it was so slow and the store was just an annoyance, it was getting in the way of me actually listening to my music. I ended up choosing MusicBee over Winamp or foobar2000 because it has all the library management stuff (even a sync to mobile device function) and a great interface right out of the box.