Nick, welcome. I'll add to Sean's comments on ratings. HK follows two practices in arriving at its power ratings which lead to lower published numbers than some other similar receivers. The first is that the rating is with all channels driven simultaneously at the full rated power for at least five minutes continuously. There's no requirement in the FTC regulations that this be done and it results in a lower number than the required rating with two channels at a time being driven(a more realistic situation for home use, since driving all channels simultaneously at full power for an extended period is a laboratory torture test which wouldn't be duplicated at home). The second factor is that HK conservatively takes the power rating at a lower point on the distortion curve than the published distortion number, again resulting in a lower rating. The result is that, for example, an HK 55 watt rating might be given as about 75 watts if rated less conservatively.
Since typical speakers, such as the M60s, use about 1 watt at a comfortably loud average listening level and even brief peaks would be unlikely to use 100 watts except in a very large room, don't be overly concerned with power ratings. Pick the features that you want and either the Onkyo 703 or the corresponding HK(probably the 635)would be excellent with your M60s.
