If you are starting from scratch, install a 100 amp sub-panel off of the main breaker box. You can then run as many 15 or 20 amp circuits as is necessary. I'd use 10 gauge for all the runs regardless of the amperage rating of the breaker. If possible, twisted pairs would offer additional noise cancelling and rfi protection. Stick with 15 amp breakers for line level components, digital components, etc... The only ones that would ever benefit from a 20 amp breaker would be a big amp that is being pushed hard. Using this approach, you could literally have four 15 amp lines and two 20 amp lines at your disposal. All of this on dedicated lines. Make sure that each outlet is wired with its' own hot and neutral with each sharing a common ground amongst them. Some electricians will run dedicated hots and share neutrals. Sean
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