With kids you won't have as much time to drive the 2nd car anyways. Get one 4 door performer (M3/M5) and call it a day.
Edit - I misread your post, but I'd still go M3/M5 and have the option for the extra space.
Edit - I misread your post, but I'd still go M3/M5 and have the option for the extra space.
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