The best spinner needs to able to rip it, spin it and drift it. Keeping that in mind, I voted for Sri Lanka, India and Pakistan. I'll put England and Australia in the shelf below, and despite the success of our flat, containment-centric slow bowling success in the shorter formats, Bangladesh and West Indies below them. New Zealand, South Africa and Zimbabwe will fill the bottom shelf.
"And do not curse those who call on other than GOD, lest they blaspheme and curse GOD, out of ignorance. We have adorned the works of every group in their eyes. Ultimately, they return to their Lord, then He informs them of everything they had done." (Qur'an 6:108)