Dedicated power

After a lot of research and consideration, mostly between power conditioners and dedicated circuitry, I have decided to go with 3 dedicated lines. One for amp one for pre and a 3rd for CD or digital. What I'm thinking is that I can pull the wire myself and then hire a professional electrician to do the breaker work and wall terminations using hospital grade outlets. My question is what wire should I use? I have heard of people using 12-2 or 10-2 but don't have knowledge of wire specific details. Anybody up on this?