Both the Denon and Harman Kardon receiver models that you suggested may actually be too much receiver for the AR speaker package. The Denon and HK retail for at least 3X the cost of the AR speakers. I would be inclined to look at the Outlaw Receiver or the Onkyo SR6000 (both in the $500 or so range). Both are fairly comparable receivers, with the Onkyo getting the nod in terms of build quality. As a side note, in my experience, when it comes to musical performance, the HK receivers have been better than the Denon receivers. The Denon receivers have better build quality, but are really just average when music is concerned. I have had good luck pairing both Onkyo (434) and Harman Kardon (3370) receivers with Acoustic Research Speakers (302) and was not very happy with a Denon (2802) pairing with speakers from AR; EPOS; and B&W. Regards.