Don't think its too ambitious at all, I think aiming big is pretty important to succeed - with a well mapped out plan, some hard work, avoiding bad luck, that's definitely achievable over a 10 year horizon.
I'm getting more and more applications for purchases in Newcastle - perhaps there's a bias given geographical proximity, but definitely noticed a pickup there.
Same reasons as you suggested Brian - Sydney overheat/ripple moving outwards. Region in between is quite popular too...