Congrats, where abouts in Aussie are you? Housing here is soooo expensive!
Out of curiosity, how do you get your money back to AUD as there aren't many AUD brokers here anymore, they all keep getting shut down?
Perth WA, the most isolated
shithole capital city in the world

For amounts under $1000 I always had plenty of friends willing to buy MTGOX/ BTCE codes off me

For the larger amounts I will be trying both okpay and direct deposit to my AUD bank account which mtgox supports.
To be safe Im doing a 30 (USD)/70 (AUD) split so I have plenty of options available.
Hang on. Interest rates are very low right now. Paying off your mortgage is probably not the best plan with interest rates so low. If bitcoins are your only investment, then perhaps you could sell some to make some less risky investments, instead. It is true that paying off your mortgage early lowers risk, but it is an extreme step when your interest rate is so low.
Im with Keystart if you are familiar with them, the cunts are currently charging higher than what the federal reserve bank advises - basically keystart is turning from a good govt initiative to a money grabbing institution. So I'll be happy to leave them anyway.
That being said, I welcome advice for other investment opportunities, I wouldn't mind owning some silver and gold but I need to research more first.
With large sums of money (around or above $100k) and not much experience, you would most likely be better off finding a legitimate irl broker or financial management service. The fees are usually reasonable (actually quite cheap imo for expert financial management that you can be involved in as little or as much as you want). They can build a risk managed and diverse portfolio covering all sorts of markets that can give you an income as well as growing value. You will probably never see the kind of returns (or level of risk) than we see with bitcoin though.
The time to invest in silver was 20 years ago, imo.