If the Navi and Bose system are the reason of getting the touring, then why don't you save the money and get aftermarket HU later on.
However, most of the aftermarket HU are integrated with Navi, and so far I know there's no face kit for installing HU/Navi into the cubby, but there are some members did that with DIY, you can search around.
If you are going to mod the Z inside-out, I would suggest you can just get the base model and use the extra money on your mods, however, you may consider the sports package, it is a pretty good deal.
GL on your purchase
