I have spent the better part of the past 3 hours reading through the forums and am considering the M80's for this reciever. The issue has been approached positively and negatively with regards to this brand and its impedance issues. It appears I may be safer with the M60's but have been told there is a benefit by going all the way up. Who has used this combination of the Onkyo TX-NR905 with the M80's and to, or with what result? The reason I ask is "Brent" at Axiom tells me "okay" and I haven't seen this reciever mentioned just the lesser models. Thanks to any or all as I need to burry the current Klipsch.