Both the 5 and 7 series are amazing vehicles! Hands down the 7 is a better alternative if you require back seat room for adults over 6ft. tall but if that's not an issue the 5 is perfect. Compare a fully loaded 550 with xDrive vs. a loaded 750i with xDrive and you'll save about 25K!
2012 550xi MSport - everything but TV's in the head rests!