Best power cords in the $250-$400 range?

Look at DCCA cables. Don's theory is that the cord on the amp (ie. the component nearest to the speaker in the chain) is the one to spend the most on. Regardless I have tried many cables, including Elrods, Shunyatas, PSAudio, Electraglide, other DIY designs, and a bunch of the "best for the buck" type and DCCA have by far had the best of all the qualities I appreciate in each of the other brands. Good pricing too, particularly if you talk to Don and ask about demos.
Check out the other threads on Audigon about DCCA.

Stuartbranson,I too own DCCCA pc's, they are very good.
Don is a world class dealer, very flexible.He likes
to take care of his costumer.

Good question...one I'm trying to answer myself right now.
I suggest that you buy a few of these listed power cords used and then test them yourself in your system and see which sounds best to you. You can always sell the ones which
don't float your boat.
A few more which haven't been mentioned yet and which you might also want to add to your short list are; Virtual Dynamics Power One, Audience PowerChord and Eichmann Series 2 eXpress6.

Pure Note Paragon. Black background, solid bass, transparent highs, and is flexible. I have them on my amps, preamp, and DAC. Best $250 I have spent.
http://www.purenote.com

I already have Paragon Bi Wire speaker cables and all Paragon I/C's between my DVD and Pre and Amp. Does anyone else have any experience running all Pure Note products?