I initially thought I wanted the Nav package in my CX-9 purchase but my wife asked me if its really necessary. She said do you think of it as a toy or something you'll use? I answered her...well, both. So my question is, $2500 is a lot to shell out for the package and I know it comes with the rear camera which is nice. But will a Tom Tom or something similar give me the same results for much less $$$$$? What does everyone think?