The only GPU over $1000 is the 2080Ti (excluding the RTX Titan since no sane person buys that card anyway) which is more powerful than the ones in both the XSX and PS5. You can certainly find a 2080 or 2070 Super and a solid SSD without breaking $1000.
Maybe, but it will be close. When I looked, the SSD (at similar XSX speeds) was ~$300. Regardless, my point is you're not building a similar PC in Australia for anywhere close to a console price point. Not even close at this stage. We'll see how it looks in 12-18 months, but I think it's going to take a while.