I'm thinking about just using my Nexus Player with my TV as it would be a better experience, but the only downside is that is does not output 4K content, so I suppose I could just use the built in applications for 4K content or just rely on upscaling. How many of you do this? I have a Samsung UN55HU6840 (I believe that is the correct model), it's a 2014 model so it doesn't even have Tizen.
EDIT: Is there a way to use Amazon Video on it?
Why not get an Nvidia Shield? It supports native 4K output, but it does cost more. Aside from that I can't really help you out, all of my TVs are dumb TVs. So I exclusively use my Nvidia Shield for everything.