@tobes The OP has a top class system, I doubt he wants to go from a DAC with ~22 bit resolution to one with ~10 bit resolution.
Most of high end or even lower end DAC could process 24-32 bit rate up to 768 khz signal depending upon the input, AND the DSD playback support up to 512 times the CD sample rates (> 22 mHz). You do not need to spend 25k-40k to have a hi-rez processing DAC. Although the differences between bit depths are inaudible and not really worth the hype, the system OP has may be revealing enough to discern those differences. In addition, I guess OP has already spend that much money on the rest of the system, the DAC musst fit in the same scale. You do not normally hear someone having a pair of $150k loudspeaker paired with $2k DAC, right?