the middle size sedan is about one of the dumbest vehicles anyone can buy... its interior dimensions are nearly identical to a 3 series with a larger exterior size and weight penalty...
a better decision is a midsize SUV with far more rear seat space such as an X3 or the ultimate X5... which it appears by sales numbers in the USA is exactly what people are doing
the only place in my mind a 5 series makes sense these days is if you want an M5 as you can't cheat higher center of gravity driving dynamics
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2 x N54 -> 1 x N55 -> 1 x S55-> 1 x B58
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