Another option is the Grow Baby Diana dream pump. The cheapest place to buy one would be from your maternity hospital they are about $140. Not as portable as the smaller medela ones but I'm told its a real workhorse and is a double pump too. In Melbourne they are available from Baby Bunting.
Have you considered seeing. Lactation consultant pre birth to get some support and a plan in place?
I have love supply so a medela symphony would be the one to hire.