Having done that, my opinions are simple;
A good set of floor standers connected to pretty much anything will sound good.
Basic room treatment will go far enough for everyone unless you’re running a sfx studio or something and even then…
Anything over 320 mp3 is basically pointless, but the better masters you get on some of these 24/96 platforms make it probably worth the subscription (sometimes).
I prefer good headphones.
And this is how i’ve avoided spending 6 figures on audio gear :)