Just so you guys know, I have searched and come up with a few mixed responses. I know the only difference between a Z1 and Z2 is software and POIs, and you can upgrade the Z1 to the Z2 but can you upgrade it to the Z3 when it comes out??? Is it worth getting the Z2 or should I just get the Z1 and upgrade it...??? I do not plan on using the HD, I plan on getting an 80GB iPod and putting it in the glove box. Also plan on bluetooth satellite radio and backup camera. It seems I can only find refurbished Z1s and I am apprehensive about these units, is it worth it just to get a Z2 from this standpoi