I've been looking into this because we are just about ready to begin construction on a new house. Here is a link and a couple specific suggestions.
1. One of the big factors you are trying to manage is the voltage at your outlet. This is a function of the voltage coming into your house plus the length and gauge of wire you are running from the panel to your outlet. If you specify a 20 amp outlet the gauge of wire for code purposes is 12 gauge. One of the links above addresses this issue. If you are doing a fairly short run I'm skeptical that 10 gauge will sound any better than 12 gauge. But if it is a long run then you want to use larger wire to minimize the voltage drop. Do not use a 15 amp breaker with 12 gauge wire. You want to do everything as standard as you can and the normal application is 12 gauge wire for a 20 amp circuit.
2. The electrical labor will be a big cost so definitely run at least two circuits. If it were me I would run 3. For my new house I'm going to have a separate panel for the listening room and I will have 4 dedicated 20 amp outlets with 12 gauge wire. My builder rolled his eyes but I'm going for the gusto in case I spend my kid's inheritance on a pair of massive mono amps (I currently run a Krell KSA 300S on a dedicated 20 amp circuit). A related constraint is the size of your main panel coming into the house. If you run 60 amps of new circuits you could max out your panel.
3. You don't want to install "hospital grade" outlets because they are stainless steel which does not have as good of conductivity as copper. Hospital outlets are designed to resist corrosion from strong cleaning chemicals. I met Caelin Gabriel from Shunyata at AXPONA a few years ago (great guy) and he told me that if I wasn't thrilled with spending a lot of money on outlets I should buy Hubbel outlets which are very good quality. I'm using these and they seem to be of stout build and they work fine. Caelin is the one who told me not to use hospital outlets.
4. Here is a link for an in-depth article on audio wiring. This is more than you probably want to know but it shows you how far you can go with this stuff. If you give this to your electrician he will likely think you're nuts but if he reads it he will get a great understanding of the issues that us audiophiles are concerned with.
https://www.anixter.com/content/dam/Images/Logos/Supplier-Logos/Middle-Atlantic/PowerPaper.pdf