These speakers seems to be bright are what it says! So you should see that you should not match bright speakers with bright amps.
What's your budget?
Some of the brands/model you can look at pairing after your demo are - Yamaha RX-A820, Yamaha Rx-v565, Onkyo TXNR616, Onkyo HT-RC180, Denon 3808, 1713, Marantz SR5007, Pioneer VSX-1016V.
You can use the Audyssey setup of the amps to tune based on your hearing experience.
Your demo will decide and get you finalised what you want to buy.
BTw, How much are these speakers?
Usually Yamaha or Marantz AVR can be a better match.Denon avr with Audyssey can also sound better.You need at least 90w power to drive these perfectly even though Klipsch are high sensitivity speakers.