Aren't they different because they are from different manufacturers? I believe the 730 was the old supplier and the 430n is from the new supplier? One is a Garmon Nav and the other is from someone else. I don't think I would base my decision on which NAV comes with the car, but if you want the forged Classic wheels or the plastic Chrome Clad wheels. Used to be the J model had the Chrome Clad and was the lower end car with cloth seats and less options to keep the price in the low 30's. The Classics had the better wheels, heated leather and they usually put the electronics on them which jacked the price into the high 30's.