My vote goes to the A8...from the cars that you own, you seem to "need" a large, spacious sedan. An E320 would be pretty much around the same size as the C43. w/ the addition of the A8, you get a large spacious sedan, a nice mid-size sports sedan, and a nice off-roader. Just my opinion.

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1995 Mercedes-Benz E420 (W124 - Black Pearl/Black)