Im a believer in aftermarket. I have a magellan 700 with the upgrades, what i like about the aftermarket idea is that if you ever take another car or want to lend it to a friend or relative its easier (id rather let my brother use the nav than the car )God forbid you are ever in an accident and are without the car for a month youll still have the nav. Plus id rather spend 800-1000$ once rqather than pay the 1500 (oem) for 4 5 or 6 years on a note with interest. good luck...just my 2c worth. Dean