You can buy my 91 750iL, there is a photo in the gallery. She has just over 100k on her, was just tuned up, and has had the transmission serviced, coolant replaced, power steering fluid replaced, brakes, driveshaft and more.
My biggest comcern is something major breaking. The two "drive by wire" electrical motors are about $900.00 each from the dealer. Spark plug wires are $600.00, and there are two rotors and caps. The car has two air filters, two fuel filters and more. I have not had any major problems with mine.