If u go with a 2bay you should go with 10tb or more. You wont be able to expand.
SHR-2 is not worth it in a 4bay imo. Shr is the way to go, its optimized for the NAS and for expanding later.
Maybe check some prizes to see what makes sense.
I have iron wolf 3TB in my NAS. But seeing they only increased in price over the last months i reconsidered.
I just bought Exos E 8TB because theyre quite a bit cheaper and should perform equally. I have to install them yet.
Is your pc directly connected to the router. Anything in between adds latency. A standard switch shouldnt give more than 1ms on top.
A higher priced router wont give you much if gaming is the only data usage at a time. Any standard router shouldnt struggle with such loads.
If u go with a 2bay you should go with 10tb or more. You wont be able to expand. SHR-2 is not worth it in a 4bay imo. Shr is the way to go, its optimized for the NAS and for expanding later. Maybe check some prizes to see what makes sense.