To add yet another voice to this...
I'd follow Mrjstark's recommendation to run 2-3 separate 20 amp lines, not just one.
Use 10ga or 12ga romex type cable (your distance is short enough not to worry with 10ga, so the 12ga would probably be fine; don't use 14ga). (If you use an armored cable or metal conduit for some reason, prepare for some additional steps...)
Run each line as a separate home run of cable from the circuit panel to the outlet, no intermediate boxes, connections or splices. Connect to only a single outlet at the end of run of cable, don't gang two receptacles at the end of a line.
Order some "PorterPort" outlets from Albert Porter here on Audiogon. They are the most cost effective outlet alternative that will give excellent sonic results.
Connect all of your lines on the same phase of your incoming power at the service panel if you have the available slots to do so.
Keep your amp and preamp on circuit(s) separate from your digital gear.
If you use a contact enhancer for other connections in your system (such as Walker Audio SST), ask your electrician to use it on the electrical power connections for your audio system, too.
Good luck. Hope you enjoy your new room!
