Please advise re dedicated circuit

Considering doing this. I mean, having an electrician or myself install a new circuit with one or two outlets for the audio system. When I finished my basement last year I did all my own wiring after consulting with a helpful chap at Home Depot so I could maybe handle it myself.

First, is it always an improvement? Some of the threads here talk about it being less than desirable if using stock PCs, which I will be doing only for my CD source - a Sony C555ES which I like very much for its changer capability and the sound is pretty good too. I might consider switching out the captive cord and getting a plug installed but I'd rather not risk the warranty loss - 5 years with ES products.

Anyway, should I use 10 gauge? And, if getting an electrician to do the job, what kind of cost should I expect? I know, it depends, but looking for a *range* here... about 70 feet or less of pretty much straight run, suspended ceiling to work through, so it should not be too complicated.

Would like to hear your experiences!