I know a lot of people on this board say not to use Onkyo receivers with Klipsch speakers. Music listening is a personal preference and each person hears music a little differently.
With that said I bought an Onkyo TX-DS797 ( after reading all of the negative responses on this board)to use with my KLF-30,s and KLF-C7 , and some JBL surrounds (hope to get some KSP-S6 if I can find for a decent price). I also auditioned the Denon-3802, an HK-AVR-520, and a Yamaha RX-V3000. These were auditioned with Klipsch speakers.
I chose the Onkyo based on sound, features and ease of use. No it's not the best looking receiver in the world, but to me it sounded the best, had the most features I wanted and was the best value of the ones I tested.
I could not tell a major difference between the sound of any of these receivers. And probably if you blind folded people and had them listen to these receivers 95% couldn't tell which receiver they were listening to. Just my two cents.
Benny