I don't know if this is exactly what you guys mean but if you use one of these
iPhone Headphone Adapter Roundup | The Apple Blog
to connect it to your aux input in your stereo then you should be cool if you dont mind mounting and using your phones touchscreen.
Also I know that the jensen vm9022 is compatible with the iphone letting you surf your iphone music library onscreen and connects to your phone using integrated bluetooth downloading your whole phone book also navigable onscreen. I know you guys may be a little apprehensive about the name brand but I have heard nothing but good things about the unit.
