Yay, another Michigander! Welcome!
In my case, with money tight, I couldn't justify dual chargers just for the "what if", when I expect to always charge overnight or at a Supercharger or other DC charger. The only reason I even considered it was because installing it afterwards costs $2100 more than the factory installed price. It will be different for every person, so consider it carefully and don't just go with what people say (opinions are strong here).
I agree with parking sensors for the reasons Lump said.
I chose air suspension basically because I wanted the ownership experience. From the reviews I've read, people are happy with both suspensions and preference is kind of split between them for various reasons.
I also chose fog lamps and subzero package since fog is common in the fall around where I live and it gets very icy in winter. At $500 each for a little added safety, comfort, and convenience, I thought it was worth it.
