Hi Vette -
If I were going tubes, I would most likely stay with the Prima Luna line.
https://upscaleaudio.com/products/primaluna-evo-300-tube-integrated-amp
I have had the PL Prologue 5 power amp for the last 20 years. Literally, no issues, which is the major consideration for me. Not so strange talk from the son of a stereo/ appliance store owner and repairman.
I have had the PL paired to a Musical Fidelity CD 24, preamp CD player - also for the last 20 plus years. I purchased a lot of stuff when I was hospitalized for 6 months back in 2005.
20 years ago, this was a $4K set-up, which would be $6.6K in today's dollars.
A Decware phono preamp rounds out the system.
Enough memory lane stuff, but suffice it to say, I am very satisfied with the Prima Luna line and sound.
If I were going solid state, the TOTL Denon looks very desirable to me.
https://www.denon.com/en-us/product/amplifiers/pma-3000ne/300995.html?dwvar_300995_color=Silver
I would go integrateds, as opposed to separates, primarily for space and simplicity reasons.
Given my age, I would also want something that whoever is still around would have to deal with.
Your current speakers look extremely nice.
Rich

