What resolution do you intend to play at? 1080p?
$650 AUD is pretty low, even to buy components alone, let alone for one configured.
An OS alone on that site is $149, with an i3-6100 setting you back another ~$150..... it'll be tough, if not impossible (for anything worthwhile).
*EDIT* Honestly, I don't see it being viable. An i3-6100, cheapest motherboard, 1x8GB DDR4 and an OS is already over $500 AUD, doesn't leave you much for a GPU, storage, PSU & PSU.