I know you said no tube integrated amps due to the need to simplify maintenance. However you want warmth, I suggest (and this is what I have done as well a few years ago) is not make a purchase now but save up until you can afford around $1500. I would then get a Primaluna Prologue Premium (preowned). They are very very reliable, sound great and easy to maintain. On EL34 power tubes they give you 35w of tube warmth with great bass and clarity, is able to drive most speakers. Your klipsch will be very easy and I think would sound amazing with the Primaluna. And then eventually you can tweak the sound to your liking by doing the center 12au7 tubes. It’s a component I feel you won’t easily outgrow and in the Looks Department, how could glowing tubes not be inviting and beautiful.
I did the leap into the Primaluna Prologue One after messing around with different amps, Mac 1900 Receiver, Dynaco, ADCOM and etc. It’s best decision I made since I went back into tubes but have reliability with it.
Here is a review of the Prologue One that’s an inter read and testament on how long they last with no frills and drama.
https://www.tonepublications.com/old-school/the-primaluna-prologue-one-integrated/
IMHO and Just my 2 cents as well.
cheers
John