As an obsessed old fart myself (not that the first two descriptors pertain to you), welcome back to, as you stated, to this great hobby.
It is rewarding on so many levels, and the extent of your involvement is such a personalized one, with many multiples of avenues to reach the end result.
Congratulations on re-aquiring a great system. I'm very curious about the Hypex NCORE Merill amps, I've been curious about how they might sound.
I might suggest a NOS PS Audio Power Plant Premier, if available, very reasonably priced, mine has served me very well for several years.
Regards,
Dan