dedicated outlet cost

also I've heard dedicated outlets separated by power and pre amp,
or digital and analog? How should these be plugged in? Poweramp, preamp, cd player, dac.

Tvad, what about keeping source on one circuit, and power hungry devices (amps, etc) on another. i know...MANY views on this..just curious of yours

I'd add, in an ideal world, that the video, i.e. TV or projector, ought to have a separate circuit also. I don't know why, but from playing around with my three dedicated circuits, I ended up with a better picture, it was deeper and had a more vibrant color. (I should add that, deplorably, I still have an old 'big screen' tv). I'll let the experts figure out why. The disadvantage, of course is cost, not only the additional run, though that's relatively small, but the extra PC or surge/spike protector.