I love my NAV too. I went with sport touring nav because:
sport = I wanted the upgraded brakes, rims, and syncro-revmatch.
touring = I loved the leather/suede combo - Always wanted suede and I also love the heated seats.
Nav = only because i hated that huge storage box that went in place of the non-nav cars.
thats my reasoning. everybody has their own. I personally dont think the music sounds like crap - but then again I am severely profoundly deaf
