Skip the AIO cooler, use the stock Ryzen one and
get a better PSU. The 5700 XT is a power hungry card and a budget model PSU is not recommended.
Get a Corasir TXm/RMx, Seasonic G series, etc PSU. Dont risk the rest of your computer by cheaping out on teh thing that supplies all the electrical power.
You also don't need thermal paste, the stock cooler that AIO you picked comes with pre-applied paste. One last thing you might want to consider a 500GB SSD, 120 gig will fill up very fast. Crucial MX500s are usually on sale and are good drives.
Also this RAM has a lower latency
https://pcpartpicker.com/product/jB...-2-x-8-gb-ddr4-3600-memory-f4-3600c16d-16gvkc