I think you have a nicely balanced (non-tube) system as is.
If changing, I would keep DAC-1 and use as a preamp. Get a tube power amp and some sensitive speakers (ie. Tekton, Klipsch, etc.) That way you get tube sound in a smaller amp that is cheaper to re-tube. If you like what you hear but need a pre for switching among more sources, get a passive.
If changing, I would keep DAC-1 and use as a preamp. Get a tube power amp and some sensitive speakers (ie. Tekton, Klipsch, etc.) That way you get tube sound in a smaller amp that is cheaper to re-tube. If you like what you hear but need a pre for switching among more sources, get a passive.