Looking to build a pc. Need help

PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 5 1600 3.2GHz 6-Core Processor ($249.00 @ Mwave Australia)
Motherboard: MSI - B350 PC MATE ATX AM4 Motherboard ($135.00 @ Mwave Australia)
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory ($279.00 @ Mwave Australia)
Storage: Crucial - MX300 275GB M.2-2280 Solid State Drive ($129.00 @ Mwave Australia)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($61.99 @ Mwave Australia)
Video Card: GALAX - GeForce GTX 1060 6GB 6GB OC Video Card ($479.00 @ Mwave Australia)
Case: Fractal Design - Focus G (Black) ATX Mid Tower Case ($85.00 @ Mwave Australia)
Power Supply: SeaSonic - EVO Edition 620W 80+ Bronze Certified Fully-Modular ATX Power Supply ($128.98 @ Mwave Australia)
Operating System: Microsoft - Windows 10 Home OEM 64-bit ($125.00 @ Mwave Australia)
Total: $1671.97
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-04-12 00:28 AEST+1000

For $1800:

Intel Build:
PCPartPicker part list: https://au.pcpartpicker.com/list/Z4BjpG
Price breakdown by merchant: https://au.pcpartpicker.com/list/Z4BjpG/by_merchant/

CPU: Intel - Core i5-8600K 3.6GHz 6-Core Processor ($349.00 @ Mwave Australia)
CPU Cooler: Noctua - NH-D15 82.5 CFM CPU Cooler ($125.00 @ Mwave Australia)
Motherboard: MSI - Z370-A PRO ATX LGA1151 Motherboard ($165.00 @ Mwave Australia)
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory ($279.00 @ Mwave Australia)
Storage: Kingston - A400 240GB 2.5" Solid State Drive ($93.00 @ Mwave Australia)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($61.99 @ Mwave Australia)
Video Card: EVGA - GeForce GTX 1060 6GB 6GB SC GAMING Video Card ($499.00 @ Mwave Australia)
Case: Fractal Design - Focus G (Black) ATX Mid Tower Case ($85.00 @ Mwave Australia)
Power Supply: SeaSonic - FOCUS Plus Gold 550W 80+ Gold Certified Fully-Modular ATX Power Supply ($139.00 @ Mwave Australia)
Total: $1795.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-04-12 00:46 AEST+1000

Or the parts you wanted:
PCPartPicker part list: https://au.pcpartpicker.com/list/n7GL29
Price breakdown by merchant: https://au.pcpartpicker.com/list/n7GL29/by_merchant/

CPU: AMD - Ryzen 5 1600 3.2GHz 6-Core Processor ($249.00 @ Mwave Australia)
Motherboard: MSI - B350 PC MATE ATX AM4 Motherboard ($135.00 @ Mwave Australia)
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory ($279.00 @ Mwave Australia)
Storage: Kingston - A400 240GB 2.5" Solid State Drive ($93.00 @ Mwave Australia)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($61.99 @ Mwave Australia)
Video Card: EVGA - GeForce GTX 1060 6GB 6GB SC GAMING Video Card ($499.00 @ Mwave Australia)
Case: Fractal Design - Focus G (Black) ATX Mid Tower Case ($85.00 @ Mwave Australia)
Power Supply: SeaSonic - FOCUS Plus Gold 550W 80+ Gold Certified Fully-Modular ATX Power Supply ($139.00 @ Mwave Australia)
Operating System: Microsoft - Windows 10 Home OEM 64-bit ($125.00 @ Mwave Australia)
Total: $1665.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-04-12 00:47 AEST+1000

For gaming you'll want better performance per core and that 8600K is better then the 1600.
http://cpu.userbenchmark.com/Compare/Intel-Core-i5-8600K-vs-AMD-Ryzen-5-1600/3941vs3919

Well with those savings dump the 1060 6gb and grab the 1070 8gb.

If you can afford the 1070 ti then I would get that, it will perform close to the GTX 1080.

It is the cheapest decent case from mwave that allows the rest of the components to fit in the budget.

Fractal Design is a reputed manufacturer of cases anyhow, it is bound to be decent.

It's a good quality case for the price and that Seasonic PSU is excellent quality.

It is a decent case. Cases depend on tastes and preferences of the user, so if you feel it is better and looks better and is within budget, please do go ahead. That said, the Design G is still quite good, so keep it as a factor when you choose your case.