when to get a shortboard?

This has probably been asked before but here goes anyway -
I am presently riding a 7'8" Aloha mini mal surf board, how do you know when you have reached a level to try out a shortboard?
The issue is that we are going to live in Western Australia in January, do I sell the minimal before going a get a short board when I get there (as i have been infomed that a new board will be cheaper in Oz) or do I pay the excess baggage and take my mini mal with me?
I am presently riding a 7'8" Aloha mini mal surf board, how do you know when you have reached a level to try out a shortboard?
The issue is that we are going to live in Western Australia in January, do I sell the minimal before going a get a short board when I get there (as i have been infomed that a new board will be cheaper in Oz) or do I pay the excess baggage and take my mini mal with me?