He is using origin for a system builder i think. It is like 6k USD for all of that gear which is overpriced for what you are getting tbh. You should have a noctua cooler, a seasonic psu and 3600mhz memory for that price.
You should try build it yourself because origin are a bit overpriced. Also you mentioned moving it from 1 case to another so this wont be that much extra effort.
Also you cant really overclock Ryzen 1/2/3000 more than 150 mhz reliably. You can PBO and AutoOC, which allows the cpu to draw more power automatically basically, but thats it really. If you want to get into it, you can get into CCD and CCX overclocking, but that takes forever to do.
Best way to overclock ryzen is to get Samsung B-die ram modules and tighten the CAS timings as much as you can, starting with Ryzen DRAM calculator as a base. Buildzoid has some PBO and RAM overclocking videos on his youtube channel.
Get a decent gen 3 SSD and get either a high capacity drive or a NAS if you are going all out for storage. Gen4 ssds dont offer much extra other than it runs hotter for no apparent gain for most people.
If you want all out, you are probably gonna have to go custom water cooling because the 240mm CLCs are not good at all compared to a good noctua cooler in terms of noise and performance. You would only go for CLCs for the absorbing heat better when the CPU spikes when idle. But it's idle so it makes no difference at all to performance.
Also CLCs WILL fail eventually, so an NH-D15 is a good choice to go all out. It performs like 1 degree better than other dual tower coolers and it comes with fairly decent paste in the box.
You shouldnt cheap out on a case. Bad airflow can cause your system to run 10C hotter for no reason. Get decent fans that are as big as you can fit in a case, so you have the most airflow at the lowest audible noise.
Also you dont need a gamer antivirus. Windows defender is adequate for most people. Not that well versed in anti-viruses nowadays, but avoid avast and AVG. Malwarebytes always a good choice.