WOW... Lots of opinions here on power wiring etc... I do agree that confiding in a good electrician especially one with re-modeling experience is a reasonable thing to do. I re-modeled a retirement cottage last year and was easily able to install 10-gauge cryo'd Romex to Pangea outlets which accept the 10-gauge wire easily to a 20-amp breaker at the panel 30-ft away. With no-load on that circuit, then powering up all of my equipment (including class-A amps) the voltage drop was ~1-volt no load to full equipment load. My audiophile friend with roughly similar equipment and 14-gauge wiring with similar distance to the panel with full load experiences a ~3 - 4 volt drop. So I feel that 12-gauge Romex would be fine unless you're going a good distance from the panel. Then 10-gauge in my opinion would be better. This was not a scientific experiment... Just an observation on our parts with voltage-drop.
Again, if you can measure your no load to full load voltage drop with existing wiring, you may not have any problem at all. Using better quality outlets just makes the connections a lot more secure.