The Porsche is amazing, but not practical for your use. You'll have issues putting the kids in the back with baby seats.
C63 is amazing fun on the street. Really fast with a lot of torque and power. A true luxurious drag car. I don't know about the track, but as far as I know the traction and handling is an issue.
E90/92 M3 is the perfect in-between car. Big trunk, back seats, performance and handling.
This is coming from a Porsche fan