Sporty used diesel in golf class for 20-25k wanted

Hello together, I am looking for a used car as a replacement for my leased Golf 7 2,0 TDI. This was always sufficient for me so far of the size. I am mainly alone and partly with escort, so a two-seater can also be considered. I have an annual driving performance of 25000 km and look for a sporty car with at least 150 hp for 20000 to a maximum of 25000 €. As a wish there stands for me a diesel with a real consumption ch (large part of rural road) of up to 6l. It should not be older than 2012 (younger models from about 2014 I would prefer) and have run a maximum of 40000 km. The space requirement is limited to the transport of a usual purchase of e.g. 2 boxes of water, also does not exclude a saloon or coupe. The equipment should include at least parking sensors, xenon, seat heating, multifunctional steering wheel and cruise control wheel and maximum navigation, Bluetooth and leather. This depends on the price-Leistu According to the history, the three main questions: 1) Golf 7 GTD (2014) vs Audi A3 2.0 TDI (2014, for optical reasons preferred as a limousine) vs BMW 120d (2014) vs Skoda Octavia RS 2.0 TDI (2014, even if I don’t need the place yet, I still find it good) which of these favorites would you choose under above basic needs? 2) Which alternatives, comparable to the ones just mentioned, should I also choose in Bet 3) How do you see the purchase of an older vehicle (from 2010) from the roadster area like a BMW Z4 23i (2011) or Audi TT 2.0TFSI (2011) at a lower price of less than 20000€? Thank you already in advance for ideas, opinions or criticism of my description!