My favourite TV box is currently on special on Aliexpress. Get further 5% cashback through CashRewards.
It has a 4K Google Chromecast inbuilt, an easy-to-navigate interface, a minimalist yet powerful remote control with voice, overall a well worth its price IMHO. It has also received the latest Android Oreo update recently.
A tip for keeping your device awake at all times (so you can Chromecast anytime): Install the app "Photo Gallery and Screensaver" and change to this app under Daydream settings menu.