Hang on 
1999 BMW 5 Series Sedan 540i 4dr Sedan
Brace yourself 
 Bought the 99 540i-6speed w M-Sport suspension2 months ago with 137K. I didn't have the BMW bug until I went with my son to test drive one. A month later I bought this car. Doing all the maintenance myself. I saw the previous owner was spending $$$ on maintenance, at the dealership. The trip to work has never been the same since. Everyday I get out of the car absolutely amazed. Accelerates like a space shuttle, turns like a cat, shifts flawlessly ...this cars performance is awe inspiring. I am sure there are faster cars, but nothing will touch it under $50K. Something will go wrong, I am sure. When it does, I will just recall this wonderful feeling and repair her back to original ;-)