I recently did a massive upgrade to my studio, and I decided to go with a Burl Audio B80 Mothership system. I've shot out a lot of upper-end converters, and most have subtle differences at best. For my inputs, I have the BAD4 cards which have a proprietary Burl BX1 transformer on the input stage, which allows me to drive the signal as I track or print sources. On the flip side, their BDA8 is the most transparent digital-to-analog converter I've heard on the market. Together, this system delivers the most musical sounding I/O I've ever heard, and it has reinvented mixing for me.
Audio Perfection and What a concept! Tracking with the Mothership has me looking for the tape machine. Burl picked up where "engineering" left off decades ago and brought the modern DAW to a whole new level. We stuffed a room full of veterans with golden ears and no one chose the Studer over the Burl...not even one. Enough said.