I bought my 2006, M3, 6 Sp Man., Convertible with 64K on the car but only 24K on an M factory replaced engine, (catastrophic VANOS failure), for $18,500.... The car looked perfect with factory condition paint and flawless interior. Enerything worked, top, radio, OEM Nav, Air, Seats, (movement and heat) and power Windows.... Since then, new rear coil springs, replaced RTAB, new rotors/brakes, all new hoses/belts, power steering line, a replacement radio/sound system and multiple brake fluid flushes..... Close to $5,500 later..... I love this car, but you'll have to expect ongoing maintenance costs... Find a good BMW private garage unless you can perform the work yourself.....