Well your post is a bit confusing, as it asks a couple of different questions:
Would you go all 1 brand of electronics?
No.
Though I am currently running a VAC integrated amp, I am using a Allnic phono stage because it is better than the internal VAC phono stage.
So my question for all of you, especially those of you who do not have all 1 brand stacks of gear. If you had to choose, from source to amp, a single brand, what would it be?
If I had to go with all one line, I guess I would stick with VAC, though there is no way I could afford their Statement Phono stage. I would hope that maybe their Signature Mk IIa preamp had a better internal phono stage than my 160iSE integrated amp.
VAC used to make DACS (Phi Alpha DAC), though they don’t anymore.
I’ve never heard the Phi Alpha DAC, but I’m sure that I could probably be very happy with one, as I enjoy most of Kevin’s work.