I heard the standard sound package sounds very "tinny" and doesn't offer much base. As a music lover I would probably choose the sound package over the air suspension if I choose between the two. Would that be a wise choice??
Yes. If you are price sensitive and plan to keep the car a while, air suspension is a bad option. Nothing against Tesla's implementation but by nature an air suspension is much more likely to break -- and costly to fix -- than a coil suspension. If you don't have a preference for the feel of the air suspension (common view here is they feel near-identical), I would not even consider it. Clearance issues are overrated; air only gets about an inch higher than where coils sit, and in most cases actually sits lower which means if you ever forget to raise it, you're more likely to scrape with air, not less.
I have UHFS and love it. I don't know if I'm an audiophile or not but I'm a musician with an attentive ear and I really appreciate the clarity of the system. Most people talk about the UHFS version having better bass, and that's true, but what really stands out to me is the clarity (I listen mostly to acoustic guitar and piano, if that's helpful). Model S is the only nice car I've ever owned so I can't compare its system to that of a Mercedes, Audi, et al.
Cold weather package in New England is a no brainer.
If you ever have to go 180 miles without charging in bad weather, I would implore you to get the 85D. If you can charge mid-way, the 70D will be fine. In the latter case, I would get the 85D if you plan to make ample use of the supercharger network (85D charges faster); otherwise I'd save money and get the 70D.
Good luck!