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I had a go at a similar build on Novatech, main differences are a much beefier GPU, faster RAM, although less of it, bigger SSD, slightly more powerful PSU:
Corsair Carbide Series 200R Mid Tower Case
Unit price £60.47 incCrucial MX300 1TB 2.5" 7mm (with 9.5mm Adapter) SATA 6Gb/s Internal Solid State Drive - Retail
Unit price £263.27 incCorsair RMi Series RM850i ATX Power Supply
Unit price £147.49 incIntel 8th Generation Intel® Core? i7 8700K 3.7GHz Socket LGA1151 (Coffee Lake) Processor - OEM
Unit price £345.98 incMSI B250M PRO-VDH Intel B250 (Socket 1151) Motherboard
Unit price £70.03 incCorsair Vengeance LED White 16GB (2x8GB) DDR4 PC4-25600 3200MHz Dual Channel Kit
Unit price £209.02 incTotal £1099.25
Cool, ok. This comes in at £1407.
RAM should be fine at 16GB. I've never had page-outs with that much and probably won't any time soon.
Still need to get a keyboard and mouse. And windows... Ugh.
It's a hell of a lot cheaper and faster than an iMac, even without that gorgeous screen.