Spectral owner for 20 years here. Hope that you find the Spectral gear that you want. I have only heard Apogee speakers back in 1988 or 89. I believe that they were a pair of Scintillas or Divas. Only had an hour with the owner at his house. Forget what electronics he was using, just too long ago. They were amazing !!
Happy Spectral owner, because they could drive any speaker that I threw at them. I used a pair of DMA 90s as bridged 200 watt monos with Thiel 3.5s that was a magical combination, even with the low impedance of the Thiel Speakers.
I think that if you can find the Spectral gear that you want, you will reach a happy outcome. Spectral provides the Hyper Resolution that you seek.
Just for your info, My Spectral System is for sale. Have gone Pass Lab Class A. Maybe you could use some of the Spectral branded or MIT ICs and Speaker cables that I have. Pre is a DMC12 with phono stage and a pair of DMA 360s mk1
Best Wishes on your Journey