Absolutely would want to keep the buttons, they are really well made and the build quality is why I'm not just getting a DVN-E46.

I'm just a little bit worried that CarPC software, while powerfull, requires a lot of maintainance to keep it running smoothly.

A TomTom with FM reciever would be another option, or grafting in a later model (E60?) nav. This is starting to sound like a pipe dream already. :lol: