Well, hmm. I went down the balanced hole a while back and concluded: (1) I only hear differences with dynamic drivers – the 789 on balanced is good for my Sennheiser HD600, but (2) I like my less technical, tube-hybrid, singled-ended Schiit Lyr 3 ($499) better…
If you’d asked me a while ago I’d probably have said the SPL Phonitor at $2,499. But, now I’d focus on tube or tube-hybrid amps and probably ignore balanced.