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
I have several vintage class A amps but I’m always looking for others. I have been looking for Levinson ML-2s. Not easy to find. I’m betting they are very expensive to update. Good luck finding a pair of the Classe DR3s. I’ve seen one for sale in 6 months. If those above are on your list then look for Krell KSA units too. 
I have always built my systems around the PS Audio power port or Cryoed Hubble outlet.😁
Pass Labs INT250. Nothing else will even come close. Add a phono preamp and a DAC and you are set.
Crazy that No one mentions the excellent Sugden A21se. They started it all when it comes to SS class A well over 50 years ago. At $3250, a bargain in my eyes. Pair it with some nice Tannoys and a tubed phono stage and I'm certain you will be very well pleased.