I have an Nvidia Shield TV. With 150$ its outside of your price range, sadly.

But: I’ve been running this thing for 7 years now and its still trucking. Compared to other smaller streaming sticks that have become unusable because of bloat firmware updates over time.

You can install custom firmware on it, but my understanding is that when you want streaming apps like Netflix or Disney to give you more than 720p output, you need the official OS.

If you want to Dodge the ads on the launcher, there are alternative launchers that can simply be sideloaded.

I don’t use Jellyfin but I have all my movies on an SMB share that I’m accessing via Kodi. The hardware is strong enough to decode any format you throw at it.