First, I would eliminate the Cayenne...you don't need a second SUV given your desire for a change. I would also eliminate the M8 as you already have a large vehicle and don't need such a large vehicle as a fun car.
Then I have a question for you: as you child gets older, and larger, do you plan to keep the car. The 911 is a great car but the back seat is a joke. It sounds like you need to have the "toy" be able to carry the child in a pinch. Can you fit a child seat in the 911? Do you intend to keep the vehicle for many years? If yes...what about leg room as the child grows?
I think I would recommend the 911 if the back seat isn't a problem and the M3 if it is. Getting a baby seat, and a baby, into the back seat of a coupe is not easy so I don't see the benefit to you of the M4 over the M3.
If you really need a full back seat, then go for the Panamera but that is a big vehicle so it is not as tossable, nor as fun, as the 911 or the M3.
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