Hey,
I lived in WA for 18 months or so, tried riding at a local school, but really didn't enjoy it there - I started helping out this lady a little bit, she's scottish but been in perth for 20 years or so I think. She breeds quite a variety of horses from welsh sec a's, highlands, andalusians and they seem pretty generously priced
http://www.torridonlodge.com/
Where are you Zaminda? Bunbury way? Thats where I was based, loved the dolphins there