http://www.bridesbymancini.com.au/produ ... &lid=10267
I know that this isnt exactly what she is after, and I think its a little over the $1000 mark, but it doesnt have alot of details, apart from the lace and a dressmaker may be able to copy it a little more cheaply.
Another suggestion could be to go into Wendy Makin on Collins Street and look at some of the other cheaper designs that they stock. Watters is definately more affordable and the girls there will not push you at all! Even if it still ends up being out of the price range, at least she can get an idea and then perhaps look at finding a second hand one.. and yes def keep an eye out for the sales on her webpage!
EDIT: BTW I tried on the above dress and it was gorgeous but totally drowned out my 159cm frame! You could tell that it was made a lot more cheaply than Wendy Makin. Kinda almost scratchy. So that would also be something to think about too..