I've never heard the Berkeley DAC. Recently I purchased a NOS Esoteric D-7 here for $2500.00. It was a huge leap of faith for me, strictly based on reputation and experience with the companies product. I have owned a Esoteric DV-50 multiple format digital disc player for many years. Right out of the box, before proper break-in, I was stunned at just how much it improved my digital playback. It replaced a Musical Fidelity 21 DAC. It may be something to consider.
Good Luck!
Good Luck!