"Power Cords-More Recent"


Have a two old PS Audio power cords in my stereo system that I purchased used in 1999 when I lived in Dublin Ohio (don't remember the model) for about $400 each. One is connected from my CD player directly to a Panamax 6 Protection Path,  and the other is connected from my integrated Amp directly to a Panamax AC 5510 AC Regenerator. My ACRegenerator is connected to the Panamax 6 with an MIT Z Cord II power cord which is plugged into the wall. My question is does anyone know whether current power cords are significantly improved in sound quality to justify replacing my current power cords with new ones? I don't intend to break the bank so $400 each is as much as I want to spend. I am using Kimber speaker cables, digital and interconnects throughout my system so in addition to Kimber I plan to  look at power cords from Audio quest, Morrow and Wireworld. Also, Should I just connect both power cables into the ACRegenerator and stop using the Panamax 6? Your thoughts please.
joscow
If your power cords are sheilded, keep them. It seems to me, sheilding is the big thing for improving things. There are very reasonably priced Chinese cords avilable on Amazon. They're woking well for me. Keep Listening to great music!
If you look at a power amplifier power supply design, they don't use regulator therefore it is much more susceptible to voltage change and variation.  Most amps (if not all) only use only a rectifier stage and use output capacitor to try to keep the voltage as constant as possible.  Because of this power cords are very important to a power amp.

On the other hand most pre-amp (if not all) use regular (with feedback and all that), so it is not as susceptible to voltage variation so therefore not as sensitive to power cord.  
Post removed 
@avitacom, @stereo5,

his ‘opinions’ are in most instances knee-jerk utterances without any personal experience on the equipment or issues in question: utterly useless.