Cable Options from Breaker to Receptacle

There seems to be a number of products suitable to run from the main panel to the receptacles. I currently use Romex 10 gauge copper, but wonder if a more pure copper would make a difference. The run is not that long, so silver may also be possible. Manufacturers include:

Neotech
Cardas
Oyaide
Acrolink
Belden

Looking at Neotech, they even make a 9 gauge copper 'speaker cable' with a very robust housing. Also, a braided silver raw power cable which is incredibly expensive, but possibly with huge implications on the sound. Of course, these would be very difficult to maneuver in some situations.

It is difficult to do head-to-head comparisons, so perhaps people can relate their experience or speak to the use of these raw cables in building power cords.

Thanks