Way over-budget for your taste I guess but I still wanted to make a note here for representation sake. Look into the brand Zidoo. I have Zidoo Z9X 8K, it’s the best client I could dream of! ~250$

Cons:

• Android based (outdated AF but still)
• Maybe not so secure (http server always on while the device is on, atm)

Pros:

• Very good support of Dolby Vision, 4K (8K maybe?)
• Very pretty, both hardware and software very polished IMO
• The remote is glorious, tactile with backlight
• Lots of other cool things
• Very snappy Android experience
• it just works™
• The audio downmixing works great, compared to the Google TV which was very bad
• First party Jellyfin support among others

There is a Gnome/KDE installer too now ;)