1) the 911 rear seat is pretty useless, moreso in the cab. Makes a nice parcel shelf I guess.
2) Not sure what wheels are on the Sl, but make sure you test drive those 18/19" 997 wheels on those "smooth" NY roads

3) 911 sits a bit lower than the SL.. not sure how old the "mom" is, but it might be a pain getting into the car
4) Is a 997C4, cab, w/tip really less money than a 500sl?
5) Post some pics once its "home"