First car for 10k

Hi, I will buy my first car at the beginning of next year, as an absolute beginner I have accordingly little idea of cars, but already quite concrete ideas. Benz,Audi or BMW , preferably Coupe possibly also limousine , gasoline budget 10000 but also 1-2k more to the necessity. Could loosen up per month 150 for insurance tax etc (without fuel ), Can be registered on mother as 1 car (50%) Will in future have to drive a lot of highway, think times a month sure 4x routes of 500km and more ,so I want directly what I feel safe with. Favorite would be an a5 coupe think but sometimes that might not be in the budget anymore 320i coupe More I wouldn’t think of the brands, I don’t like the coupes of Mercedes in the area, because I’m the ‘ass too high’ With limousines then 3s , c180 , A4 With other brands I do hard, because lack the elegance but would be open to suggestions. Optics and comfort is very important to me g for the whole, there is the a5 and the new CL 500 the Nonplusultra at the moment, just as a clue. The car should already have its 140 ps but I don’t want to race. Would the whole cost-technically realistic? Greetings from the West