I too will soon be upgrading my circuits. I have done a lot of electrical work in my two homes over the years and wanted to say first of all that 14ga wire is not typically used for outlets. That should only be used for lighting circuits. I know codes vary but thought that was a universal code to have at least 12 ga for any receptacle. You may want to have an electrician asses your panel and house design while you are doing this upgrade to ensure you don't have any potential hazards.
I have everything plugged into a Monster power center then going into an outlet that has a few other items on the circuit, but nothing major. I have another receptacle in the area so plan to upgrade both and try running the amps into one while the Monster is on the other. I was leaning to simply going 10 ga and cannot imagine dealing with 8, 6 or 4 in a wall box!! In my experience any Romex is solid...none of these products are stranded. Whatever ga you choose, I would stick with a single run direct from the breaker to the receptacle...don’t try to change wire within that same circuit.
I have everything plugged into a Monster power center then going into an outlet that has a few other items on the circuit, but nothing major. I have another receptacle in the area so plan to upgrade both and try running the amps into one while the Monster is on the other. I was leaning to simply going 10 ga and cannot imagine dealing with 8, 6 or 4 in a wall box!! In my experience any Romex is solid...none of these products are stranded. Whatever ga you choose, I would stick with a single run direct from the breaker to the receptacle...don’t try to change wire within that same circuit.