There seems to be consensus on power and room treatment.
Not quite. In my experience, also recently once again, power conditioners almost always reduce dynamic contrast, liveliness and energy of the presentation (reliably the latter two, mostly the first one as well). The only exceptions to this that I have heard are -- maybe -- the massive Tice Powerblock II from around 1990 and a not anymore produced Triangle Art conditioner.
Many people like the "black background", "cleanness", "calm" and "control" that power conditioners provide, but that is only partially due to actual benefits. Mostly it is just an expression of the reduction of dynamics, liveliness and energy. There have been discussions back and forth about this since I became an audiophile in 1990, and little has changed since then.
If you like the power conditioner sound, fine. But do NOT ever buy a power conditioner unheard, you may be disappointed. Fancy power cables are mostly problematic as well; usually best are cheap standard power cords for $ 10 or less. I have heard fancy, expensive power cords actually deteriorate the sound. Seriously, I'm not joking.
I do agree with others about room treatment. Room and speaker set-up, after purchasing all the components you mentioned, are of paramount importance.