I bought an 05, but around here all of the 06s were several thousand more, even with more miles. Mine is not the sport model and it does not have navi. I think all of the 06+ models come with navi. That might be the reason mine was less expensive than most of the others I found.
I do think the 06 interior looks better, but I am fine with the 05 version. I am not that much of a navigation user, so that didn't worry me, either.
I am a bit concerned about the dash, so I have been using a silver shade on it and it stays in the garage at home when not being used. Luckily, my wife works evenings, so the car spends a lot of time during the day in the garage.
Good luck with your search.