Welcome to the forum.
You mentioned that you have enough points - the priority for visas are sponsored (employer and state) first and the rest later and some of the visas have an age limit of 45. You want to have a realistic idea of timelines because if you are not sponsored then it can take a while due to fairly recent changes.
40K GBP is more than some come over here with so it depends on what sort of lifestyle you want and how much you'll be earning here - assuming you get a job here. I don't know what the job situation is like in Bunbury so I can't help you here.
I like Bunbury too - it was on our short list but in the end we felt it was too far away from the main population areas. We like to go to seminars and Perth is often left out and internal flights are quite expensive.
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