chocolate

I am reading about all the health benefits (antioxidant) of chocolate.  I am
wondering if any kind of chocolate is nutritious, or just certain kinds.
Where I leave (Grrece) there is a brand carrying dark chocolate.  But one of
the main ingredients is "sugar".  Should I trust and consume it?

Are there any special ingredients that I can look for?  Are there any brands
that I can order through internet?

Bob