The classics that you mention in your question are all wonderful sources of fairytales.
I would also recommend the modern re-interpreters of the fairytale genre for a grown-up audience which can also have a darker, more disturbing edge. I'm thinking of writers such as Angela Carter, Tanith Lee, Charles deLint and Terri Windling.
The fairytale tradition goes right back into prehistory and was only 'cleaned up' and reproduced as simple children's tales from the early 18th Century onwards.
Not that there is anything wrong with those sanitised versions. We all love them. Although I don't have much respect for Disney's sentimentalist massacre of the genre.
Nice question, thanks.