Pete, great to hear about that loving wife of yours! My view is that you're right to go with the 635 rather than the 7300. If power is a consideration the slight difference between the two isn't likely to be significant. The 7300 would have less than a 2dB advantage in headroom. For example, your M80s will be using around 1 watt at a comfortably loud average listening level; the 7300 would be able to play a brief peak at say 112dB as compared to 110dB, which shouldn't be much of a factor. If it would turn out(it shouldn't be assumed)that you'd need more power, separate amps of at least 300 watts would have to be added, fed from the 635's preouts. Also note that the 635 has the new room equalization system developed by Dr. Toole's group, which the 7300 lacks.
