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Dan... jmo, but mostly I think you should start at the power source, not the music source... power cords are where it's at if you are trying to do the "one thing." (another place in the system later).
Power cords for the DAC first? Not really. Ideally, power cords for the whole system, but depending on the quality and type of your system, imho, the most critical would be the amp. But this brings the questions... one of which is, which power cords?
The Cable Company "rents" cables for this reason. I'd check out the Synergistic Research T2 and T3 power cables (no affiliation with either of these firms, just a happy customer).
One thing's for sure, there is no such thing as "replacing one link..." and getting just one result. This is not a linear thing.
If you like what you are hearing now, why mess with "perfection"?
A music system is a balance of so many things (some accidental, some intentional, some just luck) that there is no such thing as changing one thing without influencing numerous other aspects of the music experience.
Again, jmo... if not power cables, I'd change the speaker cables... try a pair of Morrow Audio SP2 or SP3 Cables (60 day trial, moneyback guarantee... (no affiliation, just a happy customer). Be sure to break them in properly.
:) listening,
Ed