tyrannyPBE and AndreK,
As posted I am fond of driving my larger Home Theater, which is basically an all tower system, with the Denon AVR 4806 which is THX Ultra II
rated and has a beefier amp section than the lower end models. I could drive this system with a Denon AVR 3805, but not as loud and the experience wasn't the same (I had to replace a pair of my SS towers with bookshelf speakers to achieve satisfactory results).
That being said the Denon AVR 3805 drove an RB-75 Bookshelf based HT (slightly different 1 3/4" compression driver as in the RF-7's) 5.1 HT with great results.
I would check and see if there are any discontinued Denon AVR 4806 available for under $2,000 and any of the AVR 43XX (or 38XX) series and above should be sufficient to drive most Klipsch Reference systems, imo.
Also, as posted earlier, I am curious to see how the Onkyo THX ultra II
models pan out. They seem to be half as expensive as the Denons and if they are on par, I have no problem paying less money for the same quality in the next upgrade cycle....Inquiring minds would like to know how they are working out for Klipsch owners.