A couple of things I noticed that appear to be in error - the RF-82 II speakers are very, very easy loads (as are pretty much all Klipsch models from the cheapest Synergy to the Klipschorns). As per the specs from their site they are listed as "8-Ohm Compatible" not "4-Ohm Compatible" as indicated in your post.
I personally don't care for the directivity of Klipsch's (at least their lower end models) but you pretty much can't ask for an easier speaker to run on just about anything. Not only do they stay around 8Ohms for most of their range, but on the graphs I've seen - which admittedly don't include this specific speaker - they stay above 6Ohms even in the dips. Couple that with sensitivities that are well above any of the competition and you won't even cause a lower-end AVR to sweat.
I realize that for this post this is a moot point now, however I thought it was worth pointing out that anyone that says a Denon is not a good match for the RF-82s might as well be saying that a Denon can't run ANY decent speakers no matter what brand or spec... and that's simply not true. With a 98db sensitivity - you would already be damaging your hearing before you were using a third of the power available from the Denon.
It will be fine for the MA speakers too I would warrant, but they will not get as loud as the Klipsch would have - although in my personal opinion they will sound better (especially off-axis).
