I have tried so many power cords. I did own for a time the SR SX power cord. It was good, but, when I demoed a AudioQuest Dragon it was game over. (BTW, I also own the Lumin X1).
This power cord really locked in with my equipment. I have now bought several, all used of course.
So, you can go the continuous upgrade path or seek out a Used Dragon and be done.
ozzy