Okay one last question.
I want to start to use the dark sword. I have a high dex build. Because of that should I go with a refined 10 upgrade path since it gives me a B?
You could, but there are better weapons for a DEX build than the Dark Sword. It's great for a STR build (I got mine early in the game and infused it with Heavy, and it's been my main weapon for the 70+ hours since), but for DEX not so much. The Carthus Curved Sword is great for DEX, IIRC.