The MB thing is contagious, so far the diesel bug hasn't bit her yet although she could probably deal with an '87 TD with a little priming. She does fancy an old SL to escape in, which I'm willing to oblige when the finances allow as long as it's a 450/560. I'm sure she'd hop right into a BlueTech anything, not that one would even remotely fit within the budget, however given the size of the herd/pack/gaggle we're pretty much always stuck needing a minivan of some sort for her primary vehicle.
That's not to say that dad can't have a few cars **cough** CD **cough** to play around with.