Great thread! Exactly what I was looking for!!!! I'm likely giving my brother my E92 335i and getting an E90 M3. One of my major concerns was the baby seats.
Also, only other questions I have are:
Is the exhaust "subtle" enough if I granny it that a baby would stay asleep?
Suspension "soft" enough while driving around town with a baby in the back?
Also looking into Audi S4, Cadillac CTS-V (wagon), F30 335i...