The sport package has many other options that make the sport option worth while. The factory Bose headunit and the Nissan factory Nav is nice, I would suggest you install an Audison Bit One to integrate with the factory Bose system and then replace all stock speakers powerd Via a nice Amp. Upgrade the sub also with a CAS enclosure and one subwoofer 10 or 12 your choice. This would allow maximum sound with minimal disruption to the factory interior of the car. Do install some sound deadening materials as it really cuts the noise as well.
As for parts options that's up to your budget, I would go with the Audison Bit One for factory integration though as it's really nice to have remote control function for tweeking the system.
At the minimum get the Touring model Z, unless you really want to custom it out and upgrade everything to your liking then get the Base model. But it sounds like you would be most happy with the Sport model and do some factory upgrades. Taking out all the Bose in a Sport with Nav not sure how that looks, the Nav takes up a bunch of dash space IMO.
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