Well, unlike the Klipsch's you currently have, all the other speakers you mentioned are not real efficient. They need alot more horsepower than the Denon can provide to sound good. My vote for the lot ,is the 10t from Ariel. I have heard them in a system recently with a little NAD 304 integrated running them. While it didn't play all that loud it sure did a disappearing act. The front end was a Proceed P2P. An older setup but again, it's the sound that matters, not the cost. I hope that helps.
Powrering speakers with a receiver
I am presently using Klipsch KLF20's for my front speakers in a home theatre setup but find myself using them for listening to cds mostly. I am using a Denon 5700 for the receiver/amp. I am condidering upgrading to something like Dunlavy SC IV, Talon Khorus, or Aerial 10T. Will this work??