Generally, low end or mid-range AV receivers do not sound as good as dedicated stereo amps when it comes to 2 channel music. Again, this is in general and there are exceptions to it. If you are very much inclined towards music, you can try Marantz receivers. They are warm sounding when compared to Yamaha , Pioneer, Onkyo, etc. This doesn't mean they are inferior, but the sound signature of Marantz is more towards the warmer side when it comes to music. For movies, most of the AV receivers are on the level playing field. Personally I have liked Onkyo for movies.
What is your budget ? If budget permits you, you can try Marantz SR5007 or SR5008. I guess warm sounding AV receivers like Marantz can pair well with bright sounding Klipsch (especially for music). Other wise you won't go wrong with any of the AV receivers (be it Yamaha or Onkyo). More than what I said, you need to audition and see if you like the sound.