The NAV system on my '04 is terrific. I bought a $900 Garmin StreetPilot III two years ago and there is no comparison it terms of ease of use & it's navigation abilities. Plus when you go off route (either intentionally or not) it does broadcast "Off Route - Recalculating" like the Garmin does. If you travel a lot you will absolutely love the Navigation system.
I hope this link works, I found a leather interior for my Toyota Prius at this link. It is $499. http://www.leathertrimusa.com/cgi-bin/leat...sa/PRI05IV.html Happy Prius Driving!
Sunroofs are overrated. They leak after time, and when you open them, they tend to cause a slight (or worse) thoop-thoop-thoop-thoop bottle noise effect (given the sound that my prius makes when I open up a back window, I can't imagine them getting it right and keeping the car from making that noise). As for leather, in the Southeast it is an option and it is installed at port (in Jacksonville, I believe). The leather covers the seats, but not the armrests or the center console. Don't know how far you are from the southern states, but might be worth looking into if you are close.