well....hell. beats me. good job. don't know how i would be able to get 6GB available on a 16GB device now that i've owned the 64GB.
I don't specifically look to keep space, I just use my phone normally. If I could afford to I'd probably get 64gb and put all my music on but I actually quite like having the iPod solely for music.
Maybe it's because I have the iPod with all the music on and my iPad with all my films and streaming apps on the phone is literally just a communications device. I only have a handful of games as I'm not really into games. Nor do I take a load of pictures.