Go Max Go Foods makes really amazing vegan chocolate bars. They are all without GMO, artificial ingredients and most of them are gluten free. If you live in the US I think they are pretty easy to find. If you live in Sweden, like me, they can be found in the store Goodstore in Stockholm (both stores). They can also be bought from several websites online.
They have 9 different bars and my favorite ones are the ones in the pictures above. Twilight is a really good alternative to the chocolate bar Mars (it's really common in Sweden and I think in the US too) and White Cleo's are super smooth peanut butter in a white chocolate coating Yummy!
Have you tried anything from Go Max Go?