Purchase advice for newcomer: Mustang GT Cabrio Autom.

Hello together, since youth years I save for a mustang and now want to fulfill the dream. I was allowed to test a fastback 2 weeks ago, but 18 model, and was enthusiastic. I have not much experience in the field of cars. It is my first private car purchase. I have always been lucky to be able to drive company cars. I would therefore like to titulate the thread as a purchase advice thread for bloody beginners. I would be grateful about all the tips, suggestions, criticism or similar that should be taken into consideration when buying. Of course I am also happy about other comments about the expenses of such a car. My budget is 35-40k. Unfortunately, it should be a GT Cabrio automatic from 2016/2017. Is there any experience here about noises, etc., especially at high speeds. I have been thinking about the cabrio for a long time and now I would like to look at both variants again at the dealer’s. Cabrio however, it is not possible to test it. Are there experiences about noises, etc., especially at high speeds? I have already read some purchase advice here?