I would add Castiglion del Bosco in Tuscany.
And the Oberoi Zahra.

And to use deer's categorizations:

Close to Aman:
Dar Ahlam, Morocco

Some Amanish qualities:
Il Salviatino (Aman-level service)

And while I haven't yet been, apparently Zecha himself claims that Wolgan Valley is an Aman in all but name.

I wonder whether any the New Zealand luxury options would make this list? I am going in Jan.