I am not sure how you will accommodate for shipping costs being in Australia, but I'll make a personal recommendation for the Corsair K70. I've been using it with brown switches and have had some pretty great success with regards to both speed and stamina.
However, at the end of the day, it's highly dependent on your current playing situation. What are you currently using? How do your fingers hit the keyboard? Do you want something that has a very clear, tactile release? This is going to change the consideration of the switch you get.
However, at the end of the day, it's highly dependent on your current playing situation. What are you currently using? How do your fingers hit the keyboard? Do you want something that has a very clear, tactile release? This is going to change the consideration of the switch you get.