http://www.amazon.com/Pharos-PXT12-B.../dp/B000652LTW
it will work with 2006 version, not sure if they change the hardware or not. that's what you are looking for, but at that price, you might as well buy a bluetooth gps reciever for about the same price, or even less. (never mind you will be a much better chipset, most likely...)
yes build in gps works very well indeed, i no longer use my bt gps.