Recommendation for an Android TV box (pure Android, not Android TV)

For years I have owned a Zenoplige TX5 Pro to which I have changed firmware however it always works at the limit and now I would like something more performing: e.g. streaming when I watch car races the video is not fluid or when there are 2-3 active apps it becomes jerky.
The features I am looking for are at least 4GB of RAM and stable software; I use it mainly for Kodi, streaming and it must allow me to install as many apks as I want so it must be pure Android
I saw that there would be good Beelink gt king but it is very expensive. I ask you if there was something cheaper and worth buying