So very sad to hear of your plight. Had a close friend pass of the same lung cancer 10 years and I miss him all the time. We shared interests in music, audio, computers, food and wine and travel. Best adult friend I ever had. I am familiar with your speakers and suggest the Marantz PM8006 of which I have had the 8005 for 5 years. The amp has plenty of current and alternately drives Spendor S3/5s at 84DB, Kef R300s and Ohm Walsh 2-100s. It performs quite ably on all and delivers far more volume than my 62 year old ears need and I listen to everything from classic rock, alternative, jazz, classical, acoustic music, Hawaiian, world, etc. I also play blues guitar and will often play along plugged in...it is able to handle clearly Muddy Waters, Hendrix, Buddy Guy etc. It comes with a 3 year warranty whcih I have never had to use and is very well made in the Japan Reference factory of Marantz. It also has both a Direct Mode and tone controls covering Treble, Mid and Bass which is good for old lousy recordings that need help and for live recordings of which I have lots. Comes with a remote which makes it easy to change things. It is decent looking and very intuitive to use. Sound is slightly warm but has enough detail and dynamics to it that it compares well with my other amp a rebuilt McIntosh MC250. It can be had for under $1000 online.
Good luck, best wishes and aloha.