Yeah you already have a dynamic advantage with your sensitive Klipsch speakers! Even though receivers are dynamically at a dissadvantage, your Klipsch's help out tremendously! But, you still will increase dynamics even more, and add much more to other parts of the soundquality across the board in general in my experiences. Even if you found something like a very good used Acurus 125 X 5 amp (which is impossible to beat for the money, and more than enough for your applications), you'll still get huge sonic advancements across the board. Easily 100% improvements over all! where your sound now is likely more 2 dimmensional and a bit BLAH sounding. I think those speakers would really like a better NEUTRAL SOUNDING power amp like the Acrus. There are other amps to consider. But I think you should stay with sound like ATI, Acurus, or even adcom with those rather WARMISH tonal balanced speakers. The Parasound HCA855 is dirt cheap at like $300 used, and will still outperform your Rotel receivers amps! Also, the even better sounding HCA1205a will make a good choice overall, especially if you run your speakers as "small" on your receiver...which you should. Still, it's hard to beat that Acurus 125x5 for the buck with your speakers!. And, for like $500-600 used, you can find at least something like the Acrus 125X5 or 200X3, which would really help your sound!
Good luck
Good luck