Krutsch
Headphoneus Supremus
You might want to hold off - I mean AFAIK there will be a PHA-3 replacement... maybe PHA-4 ? At some point and I bet it'll use the 4.4mm TRRS standard
I'm curious as to what makes you say that? The latest Sony desktop DAC/amp still uses the dual 3.5mm balanced setup as the PHA-3.