Building your first PC can be an overwhelming experience -- there are just so many different components to choose from. ChooseMyPC gives you a starting point by asking a few questions, along with your budget.
ChooseMyPC is straightforward: give it your budget (it includes Australian dollars as an option), answer a few small questions, and it will give you a sample PC build. You can hover over each component to see why it chose that one, edit certain components (like hard drives), or remove ones you want to choose yourself (like the case). It will even give you a link to your build on PCPartPicker.
The beauty of building your own PC is choosing parts that perfectly fit your needs. I don't recommend using ChooseMyPC as your only source -- only you know what your needs are, and the build ChooseMyPC generates probably isn't perfect for you. But, it does make a great starting point when you're too overwhelmed to start from scratch.
Hit the link below to give it a try. If you're curious about how it chooses each part, you can read more about it here.