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Advice on whether this is a good PC for the price

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i3-8100 3.6GHz Quad-Core Processor (£94.96 @ Aria PC)
Motherboard: ASRock - Z370 Pro4 ATX LGA1151 Motherboard (£99.89 @ More Computers)
Memory: Kingston - FURY 8GB (2 x 4GB) DDR4-2666 Memory (£87.60 @ CCL Computers)
Storage: ADATA - Premier Pro SP600 128GB 2.5" Solid State Drive (£63.09 @ Amazon UK)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive (£49.96 @ Aria PC)
Video Card: Asus - GeForce GTX 1050 Ti 4GB Phoenix Video Card (£154.97 @ Ebuyer)
Case: Corsair - 200R ATX Mid Tower Case (£57.75 @ Amazon UK)
Power Supply: Corsair - CXM 550W 80+ Bronze Certified Semi-Modular ATX Power Supply (£69.79 @ Alza)
Wireless Network Adapter: Gigabyte - GC-WB867D-I PCI-Express x1 802.11a/b/g/n/ac Wi-Fi Adapter (£25.67 @ Amazon UK)
Total: £703.68
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-31 20:57 GMT+0000
 
Solution
The i3 he recommended is Coffee Lake, newer generation than the i5 Kaby Lake. The previous i3 processors were 2 core, 4 thread, the new i3 is a 4-core, 4-thread. Given some minor tweaks, and the slightly larger cache memory, it should perform on par or maybe slightly better than the older i5.

The different motherboard is to support the Coffee Lake generation of processor.