Dedicated 20a lines, 125 feet distance, which gauge wire to run?


Want to set up 4x dedicated 20-amp lines for my hifi system. The distance from the outlets to the breaker box is about 125 feet. What wires should I use? 10, 8, or 6 gauge? And should they be solid or stranded? If you could be as specific as possible that would be appreciated (brands, links, etc), as I am out of my depth here. The wire will need to run underground for a good portion, and then into craw space, if that makes any difference.
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I’m not saying you should avoid Furutech, but avoid Rhodium plating.

Oyaide and Leviton are fine brands as well.

Here’s a great source:

https://www.partsconnexion.com/ac-receptacles.html

Chris is a great guy, I’d literally call them for advice. If you stick with Furutech, I'm going to recommend the gold over copper as a much better performing outlet:

https://www.partsconnexion.com/FTECH-74278.html
This article about how to wire your house for good power will tell you everything you need to know. It’s excellent. https://www.msbtechnology.com/faq/house-power/