We are looking at Secret Harbour as well. We know Perth and have family in Mandurah and the Hills as well and whilst its still a paper based exercise, it does seem to tick a lot of boxes, espcially if your budget is beloe $550k for a house. Long commute to town if you work in the city, but hopefully being close to the beach, possibility of a pool, reasonable scholls etc and quiter suburb with a good community feel will be a good thing.
Just need to sell the house in Edinburgh first ....