@dlevi67
Welcome to the forum.
Based on the sound you are looking for (“. . . both analytical and synthetic abilities: I want to be able to hear individual instruments or voices _if I want to,_ but I also need to hear the overall musical piece and how it hangs together.”), I would say the 006 would fit your taste beautifully. But, as you suggest, you can’t fully appreciate a near state of the art DAC with dinosaur equipment. My opinion is if you have no plans to modernize your system go with a cheaper DAC. I see no reason to consider the Gaia for the same reason.