Was going to say, I use Monoprice cable for all my copper, and always the sheathed type which makes runs much more practical in a vehicle, with all the sharp metal and such going on under the carpet and panels. XT60 connectors (black would be very nice!) are a joy, and a staple since 2010 for me. Buy in bulk and don't worry about it, just make sure to get a brand that doesn't melt under standard soldering practices because those can ruin your day. Some brands are trash.