The combination of B&W and McIntosh is classic. one of the most synergistic pairing for rock music. I would not worry.
I would make sure you like the sound of McIntosh. what is your preamp? As I said, it is really great for rock. There are large number of folks that like them… they are beautiful and hold their value. I personally do not like them, they lack details and balance… and I am not someone lusting for details.
If I were you, I would plan a road trip to a major city. Make advanced arrangements to hear one with a dealer. This will take the guesswork out of it. Bring your wife, take her to a show. Make it fun.