It would be good to try and understand what about the BCD-1 makes you feel it no longer matches your system?
If you still like the sound of the Bryston you have the option of acquiring a used BDA-1 which has dual Crystal dac chips in it over the single chip in the BCD-1. When I had a BDA-1 I thought it sounded better than my friend's BCD-1.
An alternate choice would be the recently released BDA-2 dac from Bryston. More functions and most importantly they have moved from the Crystal dac chips to AKM 32 bit chips so that "should" change the sound somewhat and may get you closer to the presentation you are looking for. Upside to the BDA-2 is it should drive the prices down on used BDA-1 units as is often the case when new models come out - again this will depend on whether or not you want to still use a Bryston digital product...
If you still like the sound of the Bryston you have the option of acquiring a used BDA-1 which has dual Crystal dac chips in it over the single chip in the BCD-1. When I had a BDA-1 I thought it sounded better than my friend's BCD-1.
An alternate choice would be the recently released BDA-2 dac from Bryston. More functions and most importantly they have moved from the Crystal dac chips to AKM 32 bit chips so that "should" change the sound somewhat and may get you closer to the presentation you are looking for. Upside to the BDA-2 is it should drive the prices down on used BDA-1 units as is often the case when new models come out - again this will depend on whether or not you want to still use a Bryston digital product...