When I went to Carmax and wanted a bmw, they had a few I liked. BUT my salesman said not to do it and look at Japanese cars since I want to keep it another 10 years and drive it to 200k+ miles. His salesman friend also came out and told me about the cost of ownership, he drives them all the time and warned me not to do it, stick with Japanese. I went with a Lexus instead. I spent less and the salesman was directly responsible and good with it.
Long story short German cars don't last as long, repair bills are crazy high. I understand wanting one badly but you could drive off the lot and something breaks and it WILL cost a lot to fix. Your good deal can turn bad very quickly.
The only way I'd ever do a BMW after hearing the repeated cost of maintenance stories is to lease new.
