Depending on the configured options you want, the price difference between a 535 and a 550 is not as much as what you would expect considering you are now getting a V8. Navigation, rear camera, park distance control and multi contour seats are all standard on the 550 as opposed to the 535. If these are all options you want on a 535, it may not be that great of a price difference to look at a 550.
2013 BMW X5 35i
Alpine White | Cinnamon Brown | M Sport
2013 BMW 550i
Titanium Silver | Black | M Sport