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EMD's exact match domain names power was devalued last year. It really only works in low compeition niches. 2013 is all about brands so I would be tempted to pick a name for the name's sake and not to try and get extra serps bonuses as it's not anything like as useful as a year ago. That said. The order does matter but having the keywords in the title in any order also helps (but less). Try something like: Jaechoicarsales.com.au/melbourne and have a melbourne targeted landing page if you wanted keywords in the url