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
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.
I just put a Sahuaro Slipstream on my CD player. It is a very dimensional and natural sounding power cord. It is also very stiff. I agree with the use of Power Plants in the system. Do this before you buy any power cord. I feed my pre and amp with a P600, and a my CD player with a P300 that is also plugged into the P600. Both have Multiwave. I also feed my P600 with 220v, and have mechanically grounded it to a 10 foot ground rod. I am considering Shunyata and FIM at this time. Can you tell me how the FIM improved your system over the Shunyata?
I tried several different types and found that the Silveraudio Powerburst was an excellant ac cord for $140/1 meter.Quite musical.Excellant value.