I just acquired a 2004 A6 4.2. It has every accessory Audi sells except for the auto navigation system, which I would like to have. Does anyone have thoughts about an aftermarket system? I've looked at the various systems available but I'm not thrilled about a system I have to stick on my desk or under the mirror and plug into the lighter, and possibly hang an antenna out the window. Is it possible to actually get an aftermarket system installed so that it looks like part of the car? My Audi dealer tells me they don't really do that-- and that if they did it would cost $3000. I don't mind paying the money for a good system. Any thoughts? Thanks.