I am getting ready to wire my layout and wanted to see where others have sourced there wires for powering their layout. I looked on Amazon for 14-16 gauge wire and didn't see any solid wire. Nearly all the wire I found was stranded and tinned copper. I remember reading somewhere that solid wire is preferred for ease of soldering? If that isn't a big deal, there are plenty of choices of stranded wire. Any advice will be appreciated. Thank you!