OP, if you have $15k for only the amp(s), then you should consider the GaN-FET class D amps from AGD Production, Vivace monoblocks. They are $15 per pair. Here is their URL link:
http://agdproduction.com
Two forum threads are devoted to GaN-based Class D amp tech. See these URL links for further discussion:
https://forum.audiogon.com/discussions/gan-based-class-d-power-amps
https://forum.audiogon.com/discussions/which-class-d-amplifier-ps-audio-ghent-nord-merrill-or-other
http://agdproduction.com
Two forum threads are devoted to GaN-based Class D amp tech. See these URL links for further discussion:
https://forum.audiogon.com/discussions/gan-based-class-d-power-amps
https://forum.audiogon.com/discussions/which-class-d-amplifier-ps-audio-ghent-nord-merrill-or-other