Building new system starting with power amp. What would you choose ?


This is not how it usually happens, but what if you simply must have a particular amp and then move with upgrades in both directions? Let's assume that the only source will be RTR deck, so no preamp will be needed.
The price range..how about $15k new or used ?
This is a hypothetical exercise, I am personally not prepared for that yet. However, it would be, theoretically, perfect minimalist audiophile set-up. 
I myself would probably choose either Lamm monoblocks or Gryphon stereo power amp, both used of course.
inna
When tape deck with volume control is your source you don’t need a preamp. Electrically must be matched, though.
misguided concept from the start

why not build a system around cables you love?  🤔
Anyway, I do have speakers in my mind that I would consider first, if I could find them used - Kharma.
My fantasy amp brand is NAGRA. If I win the lottery, I want to have all-Nagra electronics.