Hello all, I am obviously new and this is my pathetic attempt at introducing myself to my fellow bimmer enthusiasts. I have a 2000 540i with every conceivable option (as far as I know). The navigation on the 2000 5 series is the one with the smaller monitor whereas the 2003 has the larger screen. Are those two nav/video display screens interchangeable? Secondly, what does the bmw community think about going aftermarket? A nice factory flush look is important to me. In the same breath, it would be nice to have modern day ammenities like ipod adaptability and bluetooth. Does anyone know if the 2003 nav/video display offers any of that? Also, does anyone know of an aftermarket brand that fits flush into the stereo console area? Your opinion would be much appreciated.