Best subsurbs to move to in Perth for mature (not yet retired) couple

Looking to run away from the east coast and relocate to Perth as a permanent home. We are after peaceful,clean and easygoing lifestyle (no kids) and something not to difficult to commute for work but still green and clean and properties not too tiny so one can have a decent yard.
Any suggestions as to what suburb we should look at?
Price wise, need to stay south of $850K for say a 3br house
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