2001 BMW 3 Series 330Ci Rwd 2dr Coupe (3.0L 6cyl 5M)
I bought my '01 with 124k on it back in '08 based on a bulk of the reviews from this site and research I've done from other sites.
Sure you're going to find people that complain that things went wrong but I was thinking of a used car with a lot of miles. I've replaced control arm bushings, water pump, coolant resevoir, valve cover gasket. I learned how to do most of the work myself so the cost is minimal and at times the work enjoyable/rewarding.
Expensive to maintain? Sure as with ANY car if you take it to the dealers. If you're looking for low maintenance neither this car nor ANY used car is it. Leasing is your option.