is there anything else I should change to this build?

My budget is roughly £2.6~£2.7k.

Part picker: https://uk.pcpartpicker.com/user/chiichii/saved/#view=KRDyqs

Is there anything that can be changed for the better? I'm using only M2 form factor storage and don't want hard drives inside as I have a NAS.

Is water-cooling still worth it or no?