Well, unfortunately, it's the gpus that get replaced more frequently. Cpus have a longer... 'use by date'. It has to do with the progression of the tech. Cpus have not progressed as quickly as gpus.
Intel is stupid expensive in Australia, so I have no problem recommending Ryzen.
PCPartPicker Part List
CPU: AMD Ryzen 7 2700X 3.7 GHz 8-Core Processor ($379.00 @ Amazon Australia)
Motherboard: ASRock Fatal1ty B450 GAMING K4 ATX AM4 Motherboard ($132.40 @ Amazon Australia)
Memory: Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory ($112.54 @ Amazon Australia)
Storage: Crucial MX500 500 GB 2.5" Solid State Drive ($88.50 @ Shopping Express)
Storage: Crucial MX500 1 TB 2.5" Solid State Drive ($169.00 @ Amazon Australia)
Video Card: Zotac GeForce GTX 1660 6 GB GAMING Video Card ($359.00 @ Scorptec)
Case: NZXT H510 ATX Mid Tower Case ($132.00 @ Shopping Express)
Power Supply: Corsair CXM 550 W 80+ Bronze Certified Semi-modular ATX Power Supply ($96.90 @ Shopping Express)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($136.00 @ Amazon Australia)
Total: $1605.34
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-09-01 17:20 AEST+1000
Let me know if I forgot anything, I can make adjustments as needed.
EDIT:
OP was asking for more than one?
Guess I misread the initial post. Ah well, I go ahead and post my suggestion anyway...