audiophile grade sub panel and breakers?

Also, I was looking at the Square D panels mentioned here but this is an older thread I was told that Siemens PL series was a good one as of now. 

Thank you Jim. It is obviously unwise to argue with Mr Ott. The only important issue in your house's electrical system, assuming your electrician was good at his job is that each circuit can handle the load it will be subjected to. Otherwise this is all nonsense and a great waste of time and money. Buy more music or a more powerful amp or better speakers. Chasing minuscule or imagined improvements is a fool's game.  

My audio system is dead quiet and and I didn't do any of this. I simply plugged a panamax  into the existing outlet. Unless you've had problems with your electrical system or need more capacity I wouldn't worry about it.