dedicated power line

I am in the process of having and electrician upgrade our home service to 200 amps. While he is at this it is quite easy for him to run a dedicated line for my hifi closet. What are the cost effective measures that i can have him put in place that have proven to upgrade sonic (and for that matter video) performance.

Receptacles are rated for either 15a or 20a, but as you said, some are not labeled. Should be on the original spec sheet.
agree with all posters but now is the time to put a surge, lightning supressor on the box.