So, I'm debating whether it would be a good idea to go ahead and order the factory navigation system when I get my C or, not and just replace the original stereo with one of the ever improving aftermarket navigation/dvd player systems available. It would kill me to pay a few thousand and then a year from now find a system that's better than the factory for less. I'm a big fan of Sirius (already have it in the car and at home, even own some stock), and many of the aftermarket units have that as well. Hmmm, I wonder if I've already answered my own question, . Any thoughts would be appreciated.