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They are both good scopes, (I had until recently an LX200 8") though if you're looking at getting into astrophotography then the LX is more the way to go. You can do photography with the ETX but you are limited with the amount of weight of accessories it can carry. The LX is a good imaging scope though you'll need to get either an equatorial wedge or a field derotator, (my preference was for the wedge.). If you decide to get into astophotography there are a miriade of accessories that can be purchased.
There are three suppliers down your way that I know of, there may be others. Bintel in Sydney, Astro-opticals from Melbourne and Adelaide Optical from Adelaide. If you do a google search for LX200GPS in Australia they will probably be the first three that come up. Their prices vary so do a bit of shopping around. As to price it depends on what size scope you're looking at.