Glad to help, Scott. I do have the VB Ref cable and was very surprised at the significant improvement it made over the standard cable. It certainly does not sacrifice musicality, but just makes an across the board improvement. I now see that BC includes it in the Ref DAC Control System package when it used to be an optional upgrade.
I haven't yet heard the Mk.II upgrade so I can't comment on how the two options compare, but here's a quote from the BC product announcement at CES: John Stronczer is always thinking how he can make things better. The DAC 3.5VB MK II upgrade delivers an improved analog supply that better isolates the PCM1792 DAC and a new low-phase-noise main clock oscillator. These changes reduce the already extremely low noise of the DAC3.5VB delivering a more engaging, musical and communicative sound. John enthuses, Weve taken the DAC3.5VB to the next level of performance!