Amanda Havens in Artarmon or Riverwood for white girls.
For asians girls just look for shops that are cheaper, like $150ish an hour or less, chances are you'll get a girl in her mid-30s or early 40s.
You can also find some on locanto.
There's no simple way to just get what you want, that's why we are called punters and the girls we like are called gems. You've just got to get out there and start trying places and girls out until you find one you like then stick with them until you are bored.