When I had my Plinius SA120, I experimented with several cords and got best results with Acoustic Zen Krakatoa and Tsunami. Good luck!
I have a Plinius 250 MkIV and I am going to convert it back to 220 volts and have its own line. You have to remenber this is from NZ and their power is 230 so it's designed for that. I was told by a dealer that the sound improvement is amazing and I it will end up costing you less that an expensive power cord. Say Robert Gray or Analysis Plus.