Thoughts on my speaker selection?

Based on your present Klipsch speakers, and your budget, I would recommend searching for a used pair of Sonus faber Venere 2.5 or 3.0 speakers. I owned the 2.5's and upgraded to the Sonetto V's. Great speakers.

The ML XT40 line hits the sweet spot in my listening. 

Ever think about Tekton? Great reviews. Made in USA. Great price. Long wait time. 

My nephew just got the Definitive Technology BP-9080's with the remainder of the 9080 series for center channel and surrounds.  No need for a sub as the tower speakers have built-in powered 12" subs.  The 9060''s have contain 10 "powered subs.  One of my sons also has a Definitive Technology home theater set-up but with a soundbar, separate subwoofer and smaller surrounds.  I highly recommend that you go with the 9060's.  

Your not giving us enough to get good advice back. 
What are you trying to accomplish with an upgrade? Is there something you like about the Klipsch, or dislike? Room size, musical tastes, amplification, etc. Not sure how people can be so quick to advise without this information. 

Klipsch especially can be tough to upgrade from since they play very loud and go low with a tiny amount of power.  
I would try and better quantify what you want to get out of an upgrade and solicit more targeted feedback.