case: https://www.scorptec.com.au/product/Cases/ATX/57222-FD-CA-DEF-R5-BK 8 internal hdd bays
cpu: https://www.scorptec.com.au/product/CPU/AMD-Socket-AM4/71983-YD2600BBAFBOX intel is a scam atm, for your budget the best you could get is a i5 8400, this gets you double the threads and negligible loss in performance in intel biased shit
motherboard: https://www.scorptec.com.au/product/Motherboards/AMD-Socket-AM4/72450-X470-GAMING-PLUS - cheapest out of the box motherboard available atm, otherwise you can wait til end of the month when cheaper boards are out and out of the box compatible, or get this https://www.scorptec.com.au/product/Motherboards/AMD-Socket-AM4/67486-GA-AB350-Gaming-3 which would require you to get in contact with the scorptec guys to update the bios before they ship it out to you. Saves you $85, the more expensive one is better but not really $85 better for you
ram: https://www.scorptec.com.au/product/Memory/DDR4/65348-HX432C16PB3K2-16 ram prices are a fucking scam right now, this is a pretty decent price for 16gb of good ram. Alternatively, you could go for https://www.scorptec.com.au/product/Memory/DDR4/67740-F4-3200C14D-16GFX which is more expensive but higher quality, but probably not worth the extra money for your use case.
All up this should come to just under 1k, maybe a little over if you get the more expensive motherboard AND more expensive ram.