If you are looking at a 2011 F10 550i, I'd certainly add a 2011 X5 50i to the list. same motor and auto, it seemed more fun to drive than the 550i.
Note the 2011 X5 first came out May 2010. My 2011 X5 50i M Sport is nearly 2 years old and I'm still thrilled with its performance and handling for such a heavy thing.
2015 M5, Alpine White/Full Black: Exec Pkg, Driver Asst, DCT, black 20s, More...
2014 X4 M40i, Long Beach Blue/Ivory-Black: Cold Weather, Technology, 20s w/PSS, Cameras, More...
Gone '13 X3 35i, '12 335is, '11 X5 50i, '09 Z4 35i, '08 550i, 06 X3, 06 650i, '02 M5, '99 540i