Nissan 300ZX / 200 SX // Purchase advice

Hello, I’m new here in the forum and I’m looking for some support or advice about buying used cars. So far I’m driving a 2000 BMW 320d (E46). It’s now 125000km down and I’m going to sell it and switch to a gasoline truck with car gas. It’s to be said that I’m going back to work 85km a day and the same distance. Overall I come to 40-50TKM a year. Therefore, the aspect of durability should be the main focus. Can you give me a few tips about the model with regard to any problems that may occur? Rust, engine flaws, longevity, other flaws, special features What should be taken into account, what mileage do the engines achieve on average? Consumption? Which engine variant is the most insensitive? Price should the frame be up to max. 11000 EUR. And can anyone of you give me the insurance ratings? currently pay for the 320d with HF and VK with 300SB 82EUR per month to 35%. Hope for numerous feedbacks. Greetings Chris