Mathieu

Hi guys, I plan to buy my first Klipsch system and I would like some recommandations about receiver. It's very difficult for me to select the right receiver with enought power and quality. My speakers configuration is: 2x Klipsch R-620F 2x Klipsch R-41SA 1x Centrale Klipsch R-52C My room size is 20x20 ft and my budget for reveiver around $600. Today I see several receivers: Denon AVR-X3200W Yamaha RX-A880 Onkyo tx-nr696 Do you have any recommandations in this selection? I have a preference for the Yamaha, apparently better with home theater effect but with low power. Thanks for your help and have a nice day. Mathieu.