Get a better PSU, refer to this list to get a better one. Choose one that's atleast at Tier C.
Also with that budget on the cooler I'd recommend a Noctua NH-D15S instead. It performs better than most, if not all water coolers (except the custom ones) and it is cheaper as well.
For your peripherals I'd suggest getting a mechanical keyboard since they are wayy better. With that budget I'd get a Reddragon Vara K551/Kumara K552 (TKL) or a Magicforce 68/Magicforce 82. Lastly for the mouse, I'd check Rocket Jump Ninja's reviews to find a good one but if you do think that one is perfect for you, so be it.