BRokicki 
2006 BMW 5 Series Sedan 550i 4dr Sedan (4.8L 8cyl 6M)
550i
 I purchased a CPO 06 550i 6 months ago with 46K miles.  This car is amazing, it already has over 53K on it and there isn't one rattle, this car really has held up over the years.  I drove a new 535i and could hardly tell the difference, so I decided to save $30K and buy it used.  This car is such a joy to drive, it begs to be tossed around. Every seat is comfortable, and there is tons of cargo room. The only thing that bothers me is that I only average 9 mpg in the city driving normally, but much better than expected on the highway, about 25.  You really need to watch the pot holes, I had to replace 2 tires at $500 a piece, don't get the sport package if you live in an area with bad roads!