I highly recommend seeking an audition of the Børresen X3s somewhere, preferably with a ballsy amp, not one of the Axxess integrateds of their sister company.
I power mine with a Yamaha A-S2100. Out of ≈40 pair of loudspeakers I’ve owned over the last decade, the X3s have been most consistently good at handling all genres, and not once have I been disappointed with any particular song I’ve played through this setup. They are also the only speaker with which I haven’t encountered at least one “wart” after a couple months of ownership. The only real “weakness” if I had to pick one is the lack of first-octave bass. With most music they play plenty deep and I can enjoy them completely without a subwoofer. Coming from Cornwalls though, you’d likely be very content with their bass extension.
I am very familiar with the Klipsch Heritage sound. One thing that both the Cornwalls and X3s excel at is low volume dynamics. I pretty well agree with Steve Guttenberg’s review of the X3s with exception of soundstage—the X3s are the only speaker that have managed to achieve soundstage depth equal to my departed Magnepans. One thing of which I am certain is that you’d be impressed by the X3’s level of refinement. That’s not to knock the Klipsch, merely stating that they’re on a completely different level in that regard. But then the X3s are more refined than most $10-$15K speakers IME.