Apologies...what I meant to say was that everything in the Swiss shops (including Swiss goods) is/are 30-130% more expensive here than in the French equivalents 15 miles away...sorry!
1. Food -shop in France
2. Rent 1.5 but 30 min away from Zurich. Train connection is perfect.
3. Get standard health plan, min cost. any private will be very expensive
4. dentist- keep in Germany
You will have a good saving done. 90K today is not bad at all. You are lucky that you got an offer...