Go get the X6, the 2012 and up offers 3-passenger in the back instead the original 2+2 seating. Trendy "coupe" styling even the 6-series now come up with 4-door grand coupe.
And who needs the M when you have V8 TT with practically 4 turbos, OK dual twin turbos where each turbine is fed by 2 cylinders, slapped Dinan S/W and that thing makes 500HP w/o even trying. Ggas prices is predicted to go down to $3/gallon by Hallowen so who needs diesel. The problem a 2-3 yr old CPO X6 is as rare as a Pegasus.