Hi there, can you please quote/recommend?

CPU: i5 8400 or Ryzen 5 2600
GPU: gtx 1060
Motherboard: no idea
RAM: 8GB
SSD: 480GB
HDD: I have 4 existing internal hard drive and 1 ssd. Can you please ensure the case is the sufficient size?
PSU: no idea
Others: I’m using this for normal surfing, watching 4K files (mine is currently stuttering, so I gave up). I think the most extensive game I’ll play would be batman Arkham series and xcom series. I’m not really a hardcore gamer, but I’d like to play the above said games on high settings without lagging. I’d mostly want the pc to be a home media for 4K files without stuttering, and be as quiet as possible. I also want this pc to be future proof for at least the next 5 years. My current pc is 9 years old, and my current gpu is HD7770 - changes once for GPU (omigod).