Older A or B class with little KM as commuter car

Hello, since I will be driving 160 kilometers each from October 4 days per week, I am looking for a car. At the moment I have none and am only travelling by train. I have read a lot here in the forum. It is clear to me that it is to become a diesel (at least Euro 5). My budget is about 8,000 euros. Leasing/financing is not possible for me. I have seen that there are older (2006) A classes and B classes with a few kilometers (30-50tkm). Is this an option or would you rather advise not? It is important that I have a better comfort and more space than in a small car. On the motorway I am not faster than 130/140. Otherwise I would also like an Astra Sportstourer or a Passat. But I have the feeling that I can make a bargain with the older A and B classes through the bidere “Renterimage”. Thanks for eu help and effort