@Sturosen , I don’t know how the Celestee cables are, but the Stellia cables were stiff as ski poles and very microphonic, which is why I replaced them. As @taronlissimore said, many Focal owners have replaced the stock cables for ergonomic reasons.
Where are you based? Personally, I don’t see the point in shipping cables from another country when you can probably get something made locally. If you’re in the US, these are the cables I’ve bought and liked:
Hart Audio. Cheap modular system with lots of custom options, from connectors to colors. Good quality, good value for money.
Corpse cable. Fairly cheap, good quality. If you just want black, these are probably the ones to get. I got their premium grave digger cables, which use Cardas wire.
Arctic cable. Range from cheap to very expensive, depending on what kind of wire you want. Well made, very good customer service. This is where the “bling factor” starts. I got OCC copper.
Double helix. Very expensive. Very bling. I bought some OCC silver cables in a Black Friday sale, and their sale price was actually cheaper than everyone else for OCC silver.
I’m not making any claims for better sound, but all the above are very well made, very flexible, with no microphonics.