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 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.