My must-haves when I started shopping (excluding color) was: LED headlights, black optics, sports package. My wish-list was prestige because of the HUD, but guaranteeing the LED headlights was nice.
I bought a prestige model without either of the other two packages. I had a black optics S6 right next to my current car and felt like the non-black optics actually had more character. It looked nicer... more luxurious. It did help that the prestige (current car) was in flawless shape. I may end up getting the all black RS6 style grille and even vinyl wrapping the window trim, negating my point here.. but just know that for relatively low dollars, you can "retro fit" a black optics package. As for the sports package, the most alluring item included was the superior exhaust. However, I plan on going aftermarket any ways, so the sports package ended up being a nice add-on if I found one with it. Audi exhaust really seems to be lacking, TBH. Funnily enough, the thing I regret most about my purchase was not getting the black headliner... not even the Alcantra headliner, I just mean the regular black one. So I went from black-optics + sports being must-haves to prestige (for HUD and LED) and black headliner. Mine has the 20" wheel package which looks way better in person than in photos. I have the cold weather package as well but haven't been through a winter yet.
Any ways, those are my random ramblings on packages. I believe the 2016.5 is on all US spec'd S6 cars, so you're solid on either '16 or '17.
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