I have the 950/7100 combo with some Boston VR-M50s as my front speakers and they sound great at higher listening levels. At lower levels with around 75db they sound a little constrained but when the wife isn't around I turn them up. These little guys really like a little more power and really open up if you feed it to them. They don't even sound like the same speakers. Once they start putting out more than about 90db at my listening level (I think the 950 is about -5 or so on the volume) they really do sound amazing. I would imagine that the m90's would probably like even more power but I wouldn't know for sure, I do know that my M50's sound a hell of alot better with the outlaw combo than the crappy Sony receiver that I had previously. Lucky for me the Sony finally took a crap on me. The 7100 has plenty of juice though, I can easily hit 115db at my listening position and it doesn't sound strained at all. If you find that the 7100 won't push your M90's well enough I would even be willing to trade you my M50's for them out a gesture of good will. Hope this helps and let me know about the trade.