What speakers do you have now? It might not be the speakers, but the issue of "Loudness" - your ears are less sensitive to low and high frequencies, so listening at low volumes with most speakers can sound a bit lifeless. Although I do not have Klipsch speakers, my Harbeth's (and previous KEF and Totems) sounded rather dull at low volume also, which is why I choose a preamp with tone/loudness controls. Yes, many will say never to tone controls, but to me, it makes my listening more pleasurable at low volumes.
I'm just saying that you need to figure out the problem first before you solve it. You may end up spending big money on speakers and not solving your issue. I will say that some speakers do sound good by themselves even at low volumes, but that's not normally the case in my experience. Klipsch's did sound quite good at low volumes when I listened to them, I simply don't have the room for them.