I'd like to design a custom-built PC designed to work with my big OLED screen as I watch a lot of free-streaming HD movies and sports games (NBA, tennis, UFC, etc). Unfortunately, these websites don't work with any smart TV, I have already tried with the latest LG OS, android OS, and other OS (Devant, etc) and they don't play these specific sites I use.

Has anyone built one already, so I can just replicate based on your experience?

I'm thinking of a small desktop with enough processing and memory to deliver good HD video and audio via HDMI and spdif.

Would appreciate if you can share similar gear and experience on this. Later on, I shall share here what I have built.

Thanks in advance.