Another purchase recommendation… Mazda 6

Hello everyone, after an economic total damage 3 weeks ago we are now facing the next car purchase. A very difficult matter at the moment … hours long search until now relatively unsuccessful. We are looking for a reliable medium-old combi (small family with 1 child therefore does not have to be a huge box ) up to 17,000 €. The plan is to buy the car with about 100,000 kilometers and then in some years with about 250,000 kilometers to sell. The car should not have a too big value loss. Currently in the selection Volvo V60 (very few offers on the market) Skoda Octavia (almost a little too big) Opel Astra or Renault Meghane (as emergency solution) BMW 3 Series or Audi A4 (something above the desired price) Now I have discovered a Mazda 6 Diesel, automatic with 175 Ps from the dealer. Full equipment 100,000 kilometer level but 2016 year for 17,000 € What would you think the best solution/model for us? Is the Mazda 6 interesting or rather finger gone Many thanks to the experts. I would be very pleased as a layman about answers.