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Hi Bob Have you seen this answer to a similar question by Gianluca posted this year - http://www.seomoz.org/q/duplicate-content-on-multinational-sites I was going to give you some input on this but who better to answer this... I have a website with two ccTLD that have the same content but are targeting their own countries - I haven't found issues with ranking myself and I think Google recognises that they are sites for the same country working in different markets and so are less bothered about duplicate content in my opinion.

Though not on your list, I would go with Perth Hotels. It has the best ratio of Keyword Difficulty to Exact Local Monthly Search Volume. Keyword difficulty score 60 with 4,400 Exact Local Monthly Searches, according to the SEOmoz tool on Google.com.au.