Consultancy Wanted/Renewed

Advice requested Night MT Community, I am looking for a suitable car for next year and need urgent advice because I am constantly desperate. First of all we are 2 (my wife and I ) in July then we get offspring so should be space in the trunk for a stroller and possibly 1-2 bags from shopping. Now something to our track profile. The car is moved every week every day 20km (back and forth). 70%city 20% country 10% highway so about 10tkm a year. Normally a city car would be enough for me but I would like to have something to have with which you can have a bit of fun from time to time and would like to know from you which option/variant would be cheaper or more reasonable…Available budget 10-15T € Insurance at approx.50% (NRW) Diesel Variants: Mercedes c320 cdi 2007-2008 Limousine 224PS BMW 330d Touring or Limousine 231PS Audi a 5 3.0 Coupe 2007 239ps Audi a4 avant or limousine 3.0 tdi 2008-2009 BMW 123d 204ps Gasoline: Golf GTI 6 Audi tfsi 2.0 Bmw 120i 320i ( unfortunately without turbo ) Renault Megane RS maybe ? So I want to use if it is a petrol engine will not be over 11-12 ltr therefore for me a 3ltr suction cup just falls out… on the other hand I think that I will not really have extra costs if I choose a diesel 3ltr machine as a tfsi 2.0 except the diesel control and that’s the same as the fuel cost more or less or not ? and even if I pay 100-20€ a year more this is for me now not immediately hell… So what do you think would be the best all-rounder package for me ?