All time favourite
Non-asian: Aletta Ocean (still kicking myself that I missed her when she was over here years ago - fucking lucky punters those who had the opportunity). Others include Silvia Saint & Breanna Banks (love old school porn). Next tier is Breanna Benson, Lupe Fuentes & Kelsi Monroe.
Asian: Kotomi Asakura with close 2nd of Yu Shinoda (unsure but she has just grown on me).