Power Cords


Someone help me understand the potential (if any) sonic effects of power cords. I have seen a wide range of prices for these things. Are they worth it, and what are some recommendations. I have Manley Neo Classic 250's.
xagwell
The Power Cord that just blew me away was a Shunyata Black Mamba. I now use Audience Powerchords on my Integrated Amp and CD player.

You take them away and something is missing. Power cords make a nice improvement in most applications.. Give them a try and see for yourself.

Chris
Unbelievable but true the last few feet make a difference. It appears to be more than just the voltage it can deliver, the alloy used has a pronounced effect on the sonics in my system. At the risk of repeating what others have said using a particular type cord should be mated to your equipment. I like a silver based cord for the source but larger copper ones for my amps.
Good plug = $3.00(each end)
Good wire = $2.00 for entire high quality powercord.

Total parts price = $8.

Total retail price OK upto $30 using general rule of thumb.

Anything higher priced won't ever give a performance improvement.
I forgot to mention that my Manley 250's are plugged into a Powerwedge Ultra 116. Now how does that effect the power cord issue?