Speaker cables for Focal 1038 Be?

I had a pair of vintage 10AWG Monster speaker cables. These things sounded fantastic. I wish I kept them. It was their top of the line cable then. Thick black insulation. Very stiff, I had to move the component rack away from the wall a bit. 

I may seek out a used pair

I would avoid avoid silver because the Be tweeter is hot enough as it is, but you never know for sure until you try it in your own system. The best advice I can give is to get some loaners from your dealer and hear for yourself.

What sound characteristics are you looking for?

My best cable for Electra 1038BE is the Mogami W3104.

I would avoid silver too.