Thanks for the discussion and your question about non-duality and teachers of non-duality.
From a quick listen to Rupert Spira so far it seems to be high quality teaching. The design of his site is exquisite! See HERE
As with other luminaries e.g Tolle and Wilber I would make the following comment;
In brief non-duality & duality are both gifts of life (God if you prefer or the Whole) – both are essential, both are ongoing. We need to work both wings in complementary harmony. The goal of life is not to eliminate duality, but to have strong, complementary synergistic experiences of duality and non-duality! Harmony requires diversity and vv.
The separate self is good – hallelujah! The small self is good – without it we would have no mastery of self. Without it no comedians would lift our spirits. Without it no artist would create.
As the great Zen Master Dogen said,
“To study the Buddha Way is to study the self,
to study the self is to forget the self, and
to forget the self is to be enlightened by the ten thousand things.”
To be enlightened by the ten thousand things is to recognize the unity of the self and the ten thousand things.
I tried to build some of these ideas into the 60 Seconds Meditation (for galloping frenetically-busy people) – HERE
Or as Stuart GuruStu Rosen HERE put it