Well, given where you're coming from in phase 1, I think a super integrated amp that includes a dac and streamer would be a nice next step, just to keep things as simple as possible. Your speakers a def the nicest thing that you have right now.
As far as options for those all-in-ones, you could look at NAD, PS Audio, Naim, marantz, Hegel, to name just a few. It's a burgeoning segment so there will surely be more to come soon.
If you don't value the simplicity of an all-in-one, you could perhaps get better sound by getting separate integrated amp and dac/streamer, and of course there are hundreds of combinations at that point.
As far as options for those all-in-ones, you could look at NAD, PS Audio, Naim, marantz, Hegel, to name just a few. It's a burgeoning segment so there will surely be more to come soon.
If you don't value the simplicity of an all-in-one, you could perhaps get better sound by getting separate integrated amp and dac/streamer, and of course there are hundreds of combinations at that point.