c class saloon size and practicality

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has anyone run a c63/c-class saloon with a baby - is there generally enough room or do you find yourself wishing you'd bought the estate?

boring topic, but I need to loko at car options soon as I currently have a coupe and it's not going to work

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Think C63 will feel old fashioned after currently running a new shape M6 coupe? Or perhaps more old-school but still great? Options in my head currently are;

C63
M5 - bigger car but and not as fun to drive as C63
New shape RS4 - not sure will be as fun to drive as C63 but obviously a lot newer

4x4's are great and practical but for my budget (up to £55K) they all seem a bit boring. Cayenne tubo ok, but mmm

Also like the fact you can buy a nice C63 for £30K, which means £20-25K back in my pocket after what the M6 is probably worth as a trade-in