Get the 850 EVO over the MX300. The MX300 is only £10 cheaper so the 850 EVO is definitely worth the premium. Also definitely get the 500GB SSD since you can afford it. Z270 SLI Plus is a decent ...

Grr. Honestly I'd have got the Eclipse P400S instead of the S340 due to the S340's limited fan/rad support. Also the X52 is still pretty over-priced so you could have easily saved a good bit of money ...

GPU: http://uk.pcpartpicker.com/product/hkJkcf/asus-radeon-rx-480-8gb-rog-strix-video-card-rog-strix-rx480-o8g-gaming

Alternate PSU:

https://uk.pcpartpicker.com/product/MfJwrH/evga-power-supply- ...

I would get a better power supply, maybe a 800w or higher and for the graphics card i would go with either a gtx 1070 or if you want cheaper maybe a 970

970 is outdated 750W would be adequate no ne ...

Budget: £1200 / $1500

RAM:Corsair Vengeance LED 16GB (2 x 8GB) DDR4-3000 Memory £117
MB: MSI Intel Z270 GAMING PRO CARBON £145
CPU:Intel Core i5-7600K 3.8GHz Quad-Core Processor &# ...