110% Dugite. Apart from a few of the outer suburbs where you will get P. australis (King brown) and P. mengdeni, (Western Brown) the only other large Elapid in Perth suburbs is the Tiger snake.
They are an extremely variable snake with reds and oranges, greens and yellows and sometimes virtually black, young snakes are generally herring bone pattern, some have pale heads and some black heads, spots or no spots, ETC
My avatar is a Dugite.