In word, overkill. I don't see the need for such a receiver with those speakers. They are 8 ohm, depending on which model you have, towers are 90db sensitivity, center and bookshelf slightly less, not terribly hard to drive. You would be fine with something like a Denon 588, 688 or 788 depending on the features you need. If specific features are driving you into that price bracket, by all means have at it. Nor would I let zone 2 be much of a consideration. You could buy an extra 588 and still be at half the price of the killer receivers above. That's my perspective, FWIW.