I don't believe any of the unsure ones you mentioned are balanced. The exception might be an Art Audio, which I think uses transformers on the output. That is, you get balanced outputs, but not balanced gain and eq circuitry. Same goes for Audio Note. Actually, the EAR might be in this category.
One you missed is the RTP from Allen Wright.
jh
One you missed is the RTP from Allen Wright.
jh