I would think a used Classe amp would be a great starting point to look for.Great amps,well made and have a touch of warmth that'll work well with the Klipsch...
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Rotel amps go quite nicely with Klipsch speakers. I use a rb991 on my Klipsch Epics. 200 watts per side at 8 ohms & 330 watts at 4 ohms. If you find a good deal on the rotel 1090, you will have 380 watts per side. That should be enough juice for your RF7's which I have heard dip below 3 ohms at times. Thats why your reciever can't handle them.
I too am taking my time and researching amps for my new RF7's.
A Juicy Music tube pre-amp and solid state Channel Islands Monoblocks is one way that looks good to me. The softness of the tube pre and the grip on the 2-10" woofers at the same time.
An all in one package integrated for me may still be the Portal 100 watt@ 8 ohms & 200 watt @ 4 ohms. I read the 7's can dip down to about 3 ohms.
There must be a thousand different combinations for these speakers.......lol.
Good Luck with your search.
You may not need "lotsa-watts" to reach your goal. You will need some current though. Watts are a product of Voltage X Amperage. Try a Parasound HCA-750 or HCA-1000 if you want ear-bleading (but accurate) sound at a reasonable price. The stated "watts" of receivers is often a number reached with less than a full range signal, a difficult impedance, or some other cryptic but legal-and-stated-in-fine-print scientific measurement. I install the Parasound amps in bars that like to "bump" with far less efficent speakers than yours.
I auditioned the RF7s recently at a "respectable" level and did not purchase them because they sounded almost identical to the Energys I already own. I'm driving them with an Adcom gfa-5802 300wpc and it is more than sufficient to 110db. The sound is warm and full but slightly rolled off up top, which you may or may not like. Either way, the 5802 is alot of bang for the buck. And in my case, changing speaker cables made a HUGE difference. Good luck. Matt.......