I have nothing but positive things to say about the Stahl Tek - I believe you would find it a significant step up from the Bryston. With that said, I have heard great things about the Lampi as well.
Best DAC for around $10K new or used
I want to upgrade my Bryston BDP -1. Considering Bricasti M1, MSB Signature IV, Lampi BIg 7 and Stahltek OPUS...