Boss330, great illustration of different AWD setup! From Motorsport aspect Audi actually realize handicap of current FWD chassis layout so next gen A8 to be the first RWD-based Audi.
http://www.autoblog.com/2012/08/29/n...-all-aluminum/
IMO, from all around performance aspect RWD should be the top choice unless limited by weather then Panamera 4’s RWD based AWD would be a good pick or wait for the new Audi AWD with RWD-based chassis layout.