Gebr. 25k or new 40k quiet and comfortable (seats)

Hello, I am looking for a new car for me. My driving profile: 20000km per year Mostly only motorway. Can change depending on the place of work again and again. I usually do not drive 140-160kmh anymore. It can also be longer distances of 500-800km I am looking for a car that is as quiet as possible in the interior also at 160 and has very good seats. Costs may be needed up to 25000 or new 40000. I do not have to exhaust these upper limits. it usually does not get the point quiet at 160kmh. I have mainly looked at cars from the middle class so far. But I am open for suggestions also from lower classes. The size of the car is not so important to me. I mostly looked for limousines instead of a car. Diesel or petrol I am not sure if diesel still has a future at all. Heisst I come with it in 2 years at all in cities. But I can imagine taking both. I have already at the top of my list Mazda 6 Sportline (After Facelift 2015) Toyota Avensis (Used/New) Citroen C5 Peugeot 508 (Used) Skoda Superb (Used) Skoda Octavia Infinity Q50 (Used) BMW 225d (Previously not, but interesting it would be ) Rav4 Hybrid Tends generally more to Japanese, since I would like to have a car that will last a long time without, for example, 4000 euros in a new DSG or similar investi he has to. Greet Christian