49er, the 520 has plenty of power for the M60s in home listening rooms. Don't give too much weight to small differences in rated power. Remember that at a fairly loud listening level the average power used is about 1 watt. Brief peaks might hit 50 or even 100 watts, but receivers like the 520 can easily handle that.
If you can be a bit patient, the M60 in cherry will show up again on factory outlet. The list changes weekly, but you might give Joe at Axiom a call to see if a pair you'd like has become available.
