I can't comment on a C2 vs. C4 since I have a RWD 911 and have never driven the AWD version. I would assume the additional weight will show in the performance, but I can't imagine that anything will be lost in translation. The C4 may have more maintenance due to the AWD drivetrain, but I do not know.
Is it possible to get rid of the wife's car and keep the M3 instead? Once you have children, you will want a larger car than a compact. Especially when you think about how much safer a larger car is.
I was lucky in that I got my Porsche just before my son arrived. If not...I think you are right. The practical thing would be to wait until they are older...because there will be other things to spend the money on...
Good luck!
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-Stan
Still Reposting, Still Pimping
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