I'm not sure about local pricing but the drives and PSU seem fairly low end for the asking price. I paid around $220 for a 1TB SSD over a month back, and 500GB drives are going on sale for around $120. HDDs, a good 2TB drive is easily found well under $100. CPU is $250 at best; with a new Ryzen generation I'd expect a 1700X to be heavily discounted.
Based on prices I can find in the US that is a hard pass, especially as it is used. And Nvidia is on the verge of releasing a new generation. I wouldn't pay top dollar for a GPU model that is close to two years old. Now, maybe in Australia that is a steal but I wouldn't recommend it was really an amazing price in Australia.
In terms of performance it will run most games maxed out at 1440P though. I have the same GPU and a Ryzen 1600 at 3.8GHZ and it is a very competent system. So performance wise it will be fine. But as I mentioned, the GPU is getting a bit old and may start being slower for upcoming games...