Joe 
2005 BMW 5 Series Sedan 545i 4dr Sedan (4.4L 8cyl 6M)
545i; a great performer
 I recently purchased a pre-owned 545i, with about 55k on the clock.  The car is tight, without creaks and rattles, and the interior still looks largely new.  My previous vehicle was an 06 Lotus Elise, and even so, I would say this car drives impeccably. Everything from the engine, to the weight distribution, to the suspension (sport package) to the transmission (6sp MT) is perfect.  My only complaint with the whole car is the iDrive system; it's too cumbersome. Simple tasks like changing the radio station or ventilation settings should be easy to do with individual knobs without resorting to a series of menus.