E class AMGs would be a great combination of power and DD comfort, plus it's an adult car that wont' get you pulled over every other block. I have heard that the W211 E was extremely soft from a reliability standpoint, in the early-mid 2000s Merc really shit the bed on that front. I believe they've righted the ship though, a friend of mine has a W204 C63 and a W204 C350, both have been pretty much rock solid, though he puts very little mileage on 'em (20K in 4 years).
E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP
F30 N55 XDrive EBII