A Bryston Suite? I was a Bryston guy when I spend most of my time with my speaker systems, the original 4B without ST,
You are building up a very impressive headphone collection around your Benchmark and Bryston system, are you selecting headphones with different sound signature, to compliment each other instead of completing against each other? I bet everyone are waiting for your impression and comparison on your classic/TOTL headphones. I am looking forward to that too.
By the way, talking about complementing headphones, have you considered the RAAL SR1a? Its completely different from Empyrean but not a choice available to most headfier because of the unique driving requirement of the SR1a. However your 4BSST2 should serve the purpose.
Andy