Used car purchase R8

I’m not the first to do this project now. Nevertheless, I’m doing my own thread for such a big project. Would you like to change from my A5 to an R8 soon (next year at some point). So far I have set up 70-80k€ for an automatic from 2013. Can you predict something about the price development now where the “new” comes from? In summer rather not buy?! In any case during the test drive at the TÜV on the lifting platform or? And let read out history (which is to be paid attention)? s were the flaws in this series? Some things have already been fixed in the 13s… Can you pay such a sum easy cash? Do you then possibly get a discount? Since this would also be my first needed car purchase I would need the whole standard tips again to make sure as much as possible that you don’t make a mistake. Am already thinking of getting me a professional that I can take with me, which I of course then also pay for…