Well, NAS is quality armor... but you could make your own for about... 1/6th of the price in materials (including shipping of bondo or fiberglass cloth if it's not available in Australia, if it's there then it'll go down a bit). Depending on your patience and how well you read the tutorials here, it'll be just as good quality, and you'll have the pride of knowing that you took the time and your own two hands and made it yourself.
However, if you just don't have the time and you have the money and feel you absolutely want to use your money on NAS's suit (those suits ARE damned good), then go for it,. It's all your choice