Did you find a box? Looking for something with similar specs, only be using it to play mkvs from external hard drive. Could do with gigabit LAN as I have 1000mbps internet. I've done a lot of reading on this thread but feeling a bit confused... I suppose the simple solution would be a Minix U9 but that's almost Nvidia Shield money where I live!
Currently using a cheapo x96 s905x 1gb ram box that I had gathering dust in a drawer, it works but sometimes buffers or freezes with high bitrate 4k mkv's.
None of the current crop of Amlogic boxes are supported under LE running Leia, this version has effectively been skipped at this stage.
The current crop of S922 and S905x3,S905D3 are not supported in LE.
The older boxes such as S905x2 are supported in community builds of Krypton - but are no longer actively supported by the developer.
There are alternatives outside of LE, but the new crop of boxes are not that cheap (ie €50+)