Dedicated lines: use isolated grounds? Subpanel wiring?

[lem321]

I've perused the forum for information on dedicated lines for my audio system. Some recommend using an isolated ground (IG) in their lines, while others have not. While I'm in the process of putting together a shopping list of parts, I must also choose some audiophile duplex receptacles. Most of the well-known ones mentioned here (e.g. Oyaide, Furutech) do not seem to have a model with an IG facility. Does this make an IG somewhat of a moot point?

Secondly, having my electrician also add a subpanel which will be about 25-30 ft. from the main panel. What do you recommend I use to connect the main to sub panel? 3 gauge is commonly mentioned. Should this be run in an aluminum, steel or other conduit (impractical to run it inside the walls)?

Thanks in advance for any advice you may offer.