Unless I'm thinking of something different, I heard the factory iPod connection isn't great and it only allows you to play music through playlists or something?
Wireless adapter isn't much good as all of my music is on an iPod classic! Archaic I know but it's the only device I can fit all of my music on to (it's 160GB) so I'm reluctant to move away from it. I'm usually the first to embrace new technologies, but for some reason I can't seem to get into Spotify and the like.
NBT looks really cool, but not sure I'm up for spending that much...