I use the budget Belden 19634. It is only 30 cm long to the wall socket as my P10 is sat on the floor tiles. I think the key thing is have a clean ring main from the fusebox, no other devices on that line especially fridges and such. That ring main is 30 amps and the in wall cabling is 45 amps.
I wouldn't go nuts on mains cables unless you have longer runs. I use Cardas plugs and IEC sockets and hifi fuses in everything. It all helps.
If you must have any switching wall warts in the system get them behind a filter or better, replace them with a linear power supply, and reduce the noise both up stream and downstream.
Listening to some Deep House music right now, hell the 009s and my KGSShv are now a serious bass monster, yet still with the incredible transparency of electrostatics, incredible combination!
Thanks. I would like to start trying some cheap ones first. I've spent a lot this year, though it is just Feb.