Another one for Whittakers! And they still make the small slabs, you can get peanut, almond, and my personal fave, coconut. Alas, here in 'Straya we don't get the full range of Whittakers.
Shout out to Green and Blacks. They make amazing chocolate. But they're a British company and it hasn't been available in 'Straya for a few years now. :-(
Oh! Almost forgot Tony's! It's fairtrade and gorgeous. And widely available.
I too am yet to encounter any good American chocolate. I mean, there must be small time producers there doing something good. But I'll never encounter them.