List of components:

ALTERNATIVE 1

Total price around £1150
Case –
Cooler Master Elite 130 (Around £40)

CPU –
Intel BX80684I58600K 8th Gen Core i5-8600K Processor (Around £230)

Motherboard –
Gigabyte Intel Z370N ac WIFI Coffee Lake Mini ITX Motherboard (Around £140)

Cooler –
Corsair Hydro Series H55 High Performance All-in-One Liquid CPU Cooler, 120 mm Radiator (Around £55)

Video Card –
Nvidia Geforce 1060 GTX 6g ( Around £300)

Memory –
Corsair Vengeance LPX 16GB DDR4 Memory Kit (Around £160)
G.SKILL 16GB KIT DDR4 3200MHz CL16 Trident Z RGB (Around £200)

Storage –
Samsung 850 EVO 500 GB 2.5 inch Solid State Drive (Around £125)

Power supply –
Corsair SF Series SF600 SFX 600 W Fully Modular 80 Plus Gold Power Supply Unit (Around £100)

ALTERNATIVE 2

Total price around £1003

Case –
1. Cooler Master Elite 130 (Around £40)

CPU –
Intel Core I7-7700k (Around £253)

Motherboard –
MSI H270I Gaming Pro ac WiFi Kaby Lake Mini ITX Motherboard (Around £115)

Cooler –
Corsair - H60 54.0 CFM Liquid CPU Cooler (Around £60)

Video Card –
Nvidia GeForce GTX 1050 ( Around £190)

Memory –
Corsair Vengeance LPX 16GB DDR4 Memory Kit (Around £160)

Storage –
Samsung 850 EVO 500 GB 2.5 inch Solid State Drive (Around £125)
Intel 600p 512GB M.2 NVMe PCIe SSD/Solid State Drive (Around £170)

Power supply –
Corsair - CXM 650W 80+ Bronze Certified Semi-Modular ATX Power Supply (Around £60)

ALTERNATIVE 3

Total price around £902

Case –
1. Cooler Master Elite 130 (Around £40)

CPU –
Intel Core I5-7500 (Around £152)

Motherboard –
MSI H270I Gaming Pro ac WiFi Kaby Lake Mini ITX Motherboard (Around £115)

Cooler –
Corsair - H60 54.0 CFM Liquid CPU Cooler (Around £60)

Video Card –
Nvidia GeForce GTX 1050 ( Around £190)

Memory –
Corsair Vengeance LPX 16GB DDR4 Memory Kit (Around £160)

Storage –
Samsung 850 EVO 500 GB 2.5 inch Solid State Drive (Around £125)

Power supply –
Corsair - CXM 650W 80+ Bronze Certified Semi-Modular ATX Power Supply (Around £60)