Faye Dunaway, in her prime.  Liv Ullmann.  Isabelle Huppert.  Meryl Streep.  Helen Mirren.  Julianne Moore.  Isabella Rossillini (though she has had a few mis-steps).  Lili Taylor.  Jennifer Jason Leigh.  

Some recent actresses that are impressive: Samantha Morton, Toni Collette, Sarah Polley, Naomi Watts (solely for 'Mulholland Drive'), Emily Watson, Kate Winslet (excluding a few films, one involving a boat).