What AC Power Cord sounds best?


I'm looking to upgrade my power cords. I currently have 4 Synergistic Research AC Master Couplers in my system. They sound great but I understand there are some others out there with a quiter background, better bass, increase resolution, etc. Please let me know of your experiences with the 'really good stuff'. Thanks!
jaguar
Hi Jcbtubes. Great advise. In my system PS 300 was an improvement. The FIM was a sonic knockout. I borrowed a SR Reference. IMO the Coincident PC is as good or better than the SR Ref. Neither Coincident or SR Ref. as good as they are can perform at the level of the King cobra or cobra. Have not heard cobra or KC V2. I thought I was done with PCs. Then I heard the FIM. I need more FIM.
I have had great sucess with FIM power cables. replaced my Electraglide Fatboy, Siltech, Marigo and NBS.
I've borrowed/auditioned nearly all mentioned here, yet nothing comes close to the FIM Gold. The FIM Silver is nothing to shy away from either, yet it isn't as good as the Gold.