@OldSchool1948, I feel your pain. I’ll be 70 next week and can’t imagine trying to move a BHK250 or BHK 300 even a few feet let alone down stairs to my basement. To avoid that situation, I’ve put off a BKH250 vs. M1200 decision until I’m older - and hopefully wiser. For now, I’m expecting delivery of a BHK preamp on Tuesday and will probably upgrade my DAC before revisiting a replacement for my M700s.
You, on the other hand, being so much older (and probably wiser) than me, have already upgraded your pre and DAC and must now face the difficult amp decision head on. If I were at that point, I’d probably wait a few more months and see what insights come out of the pending professional reviews of the M1200. Those reviews won’t tell you exactly what the M1200 would sound like in your system, but they may point out characteristics of tonal balance or performance issues that could influence your decision.
It’s great to hear from another “seasoned citizen” who is still seeking better sound rather than just shutting down their musical journey and retiring from life. Stay safe and keep getting wiser!