After working 6 years since leaving school, I am finally at the point where I can go to college. I have been planning to go at either a nearby private liberal arts college (20 miles away), or at the local university (45 miles away). I will be commuting at least 3 days per week (still working the rest of the time). I need a reasonably fuel efficient, reliable car to do this with, but I still want the luxury and quality of a Mercedes Benz. However, I am unsure which model is the best for doing the job. I was thinking about either a W124 or a W201, or possibly even a W123. Not sure about Gas or Diesel. I don't want to spend more than 5k. (Trying to save up for a older 107 SL for my "personal"

car.)
All advice will be greatly appreciated,
Thanks, Dave