I am in the market for a BMW 850, nothing else will do! After searching the Internet for reviews and advice, I have found little information (except this forum) that is useful to me. I understand the 850 cars to be difficult and expensive to maintain. Is this true? If so, roughly what should I plan on spending each year in up-keep? More importantly, what should I look for (year, model?) when I am shopping the few available 850's. Any instruction, direction, or advice would be much appreciated.