I'm gonna put my vote in for an E-Class wagon. It combines both your wife's and your needs. It isn't too large being the size of a Camry, it will handle well since its not a tall SUV, and it can haul absolutely anything due to the deep cargo hold, while still having enough power from a tried and true Mercedes V6, its incredibly luxurious and comfortable, and its a wagon, so you will own something that is very rare to come by and these cars are very sought after by Benz enthusiasts.
Dealers may be willing to negotiate since its harder to find buyers for this type of vehicle and there are a good amount of CPO'd low milage variants to choose from.
https://www.caranddriver.com/reviews...n-reliability/