I don't mind spending about $100 for a good extention. I tried the Radio Shack ones (please forgive me), and they sounded yech. Right now I am using about 15' of 18 gage stranded copper wire with PVC insulation. It does not sound too bad, even with the Red Clou at the end of it. Very surprising. Problem is, the cable I made kinks easily, and the wire is hookup wire and not really made for a lot of flexing and stepping on, which I do. So I need a good cord.
What I really want is at least 18 gage cable, with good (not PVC) insulation. I don't need solid gold neutron free connectors, just decent stuff.
All the popular premade cables don't specify cable size and usually don't mention insulation type. I really don't want to upgrade until I know that info.
Then again, if I settled for the standard HD600 cable for so long, I should not be so picky!

But if anyone knows about the specs of any particular cable (Kimber, Ted's Earcandy, DiMarzio, etc), please let me know. I am having difficulty finding this on the web.