Love my Sugden LA-4 pre, with those Klipsch I’d totally think a Sugdan amp would be for you, I absolutely love the Canor Virtus i2, but being tubes... ugh that’s a phenomenal amplifier now with pre outs. Lastly what about a Cambridge Edge A. I have my Azur 851a and it’s an amazing integrated (discontinued) and the edge line just notches all that goodness up a level.
So many choices!
My absolute favorite integrated amps as of now are my Riviera Labs Levante and Technics SU-R1000.
Would love to try a Pathos InPol amp which again sounds like it would be a great choice for you.
Good luck and happy hunting
Let us know what you find.