I think crow answered your question really well. Just to add my two cents, I think something else to consider is how difficult a course like medicine can be and how much you will need to rely on your support network. While I don't doubt that you will make an amazing group of friends at UNE, even simple things like having a home-cooked meal (assuming you'll be staying with family if you stay at JCU) can go a long way after a long day at uni. While facetiming and skype sessions exist, it's not really the same as being at home with your friends and family when you're going through a particularly hard time. A fair amount of my friends who did their undergrad interstate founds ways to come back home and do their postgrad at home. And like crow mentioned, it's also important to consider where you'd like to do your internship as it'll be a little more difficult to get one in your home state if you didn't attend med school in that state (but that's not to say it's not possible!).