Purchase advice: 960/S90, or 850/S70, or S80 I limousine?

Hello Volvo friends, I would like to buy a youngtimerlimousine from the 90s (possibly also early 2000s). The 9 series is awarded great quality, reliability and also very good rust prevention, is this also true for 850/S70? I am looking for a saloon with 5- or 6-cylinder gasoline in very good condition with the following minimum equipment: Safety: – ABS – Airbags for driver, passenger and side airbags – 3 3-point harnesses and headrests back Comfort: – Air conditioning – Central locking – Power steering The S80 I could theoretically be considered, but is it as good as a 960/S90 in terms of solidity and rust prevention?