Purchase advice Volvo S40/60 II

I wish you a good Sunday, My Astra will now have to stop as a summer car and for that a comfortable second car has to come. I used to drive a Volvo 440 and was always completely satisfied with it and thought I was looking for a Volvo again and came across the S40 and S60 models. The problem, however, is that I don’t know about Volvo anymore and wanted to ask you for help now. The first question I ask myself is, where is the Great Unte? Is the S40 a middle class and the S60 an upper middle class vehicle? Which machines are recommended and which machines should not be taken at all? How high is the consumption and is the machine also E10? Teeth belts or chain? (change intervals) What is the problem of rust, because my 440 at the time was quite vulnerable? What should I pay attention to when I was looking at the S40? What kind of equipment is Volvo the highest, or what is it called? I mean to have heard that Volvo is now also Ford and now I wonder if the robustness (sweden steel) is still there as it used to be? That should have been it for now and thank me in advance for your help MFG Devil