Hi and welcome
Definitely you want the sports package, which is well worth the money (brakes, rims, vlsd, suspensions....). The touring adds more luxury things like leather and heated seats, rear view camera, Bose sound system, etc (don't remember everything on top of my head). NAV is not part of a package so you'd have to add it. Sounds more like you'd be fine with a base+sport from what you say. You won't regret a Z