sorry, editing because computer is buggy...
I'll politely disagree with the comments from our friend in the Netherlands. The Australian stockmarket is not heavily tilted towards Mining. It is 50% financials (banks, insurance and REITS).
So the real risk is credit markets, not chinese iron ore prices. BHP, WPL and RIO already have the expected bad news in commodities priced in, potentially it is the time to buy those 3.
Just make a non-concessional contribution to your super fund in the name of the whoever will be retiring first (you can fight with your wife over that). You are capped at $150k for this, however you can bring forward the next 2 years and dump $450k in at once if you choose. Just don't go over otherwise the tax rates are punative.
As happy posted, salary sacrifice up to your $25k limit. Once you (or your spouse) turns 55, start drawing down a transition to retirement pension and recontribute it to Super (google the strategy).
Choice of super funds is another matter. I don't buy into the SMSF craze. A low cost industry fund is generally the most hassle free (such as REST, Australian Super, HESTA or First State. They will do better than any other vehicle in the industry.
$60k will likely be a minimum in 10-15 years time for a family of 5. COL in Aus only ever goes up, no matter how mustachian you are, especially if you have kids that will take school fees, sport, clothes, iCrap etc.
I live on the absolute bare bones minimum (including mortgage) and my expenses for a single person are $18k a year. If I had to rent it would be $32k a year. For a family with kids after COL inflation over a decade, you gotta be realistic. When the kids go, then $60k will be more than enough, but until be conservative and add a bit more.
MIMPC, you and your spouse are doing well for yourselves and your family. Don't buy new cars, don't spend on frivolities, always look for better deals on the big ticket items and you will be fine. My parents reached similar goals that you currently have and you have more time and more money with which to accomplish it. Set goals, stick to a plan and let time and compounding do the rest.
cheers