On behalf of my fellow Aussies, we're glad you like them.

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The size increments and the metal types make much more sense than the coins from here in the states.
Since the cost of making these coins is hovering around the actual face value, it probably won't be too many years until we do what New Zealand did a couple of years ago and reduce the size and/or change the composition of the denominations, and probably eliminate the 5¢ coin at the same time.
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Now the problem is which denomination to go after first!
Unlike the United States, where many collectors seem to collect or focus on just one denomination or type, most collectors here in Australia collect them all at once. Decimal coins have only been around since 1966, and there are very few "hard-to-find" dates in each of the denominations. There's also much less variety, as far as mintmarks are concerned.
All the best with your new collecting interest; there are plenty of locals here on the forum to help you out.

Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis