Couple of things to think about...
If your looking at staying within the Android box market and NOT a sbc then i would say i am not sure whats really out there cheap enough with 4 gb or ram that really has real stable firmware when looking outside of the normal installed Android that comes on the box.
If you specifically want LE and want to stay within the Amlogic realm then you will need to wait for awhile (as LE is in the middle of trying to migrate parts of their core up to the mainstream (linux) which has lead to them not really supporting Amlogic in their current development tree while this process is going on...
With that said tho... if your able to handle building their sources on your own theres no reason their current build can't be patched up to build a Amlogic using the newest Kodi (Leia) and on one of the older none 5 kernels... Its just not something i think any of the LE guys are going to do so you''ll be on your own... I know i have done it multiple times and i know others that are still doing it for their own purposes...
If you want LE without the hassle of building yourself then you probably need to look around here at NON Amlogic boxes to see whats available,,, Rockchip, Allwinner or Rasp maybe able to give you what you want...
Things are pretty fluid these days as people try and fix or find solutions to the GPU issues which currently plague the Amlogic and Rockchip SoC's when it comes to hardware acceleration to any Non-Android OS running on ANY of those boxes and there is no way of predicting if or when those issues will all be solved at this time...
If your trying to get out from under those conditions then you need to look at other things like the H2 which is a SBC or some other Intel based device thats not prone to the GPU issues...
In some ways depending on what you want to do it may be better to just stick with a older box that actually has Leia support that works for the time being till things...
Finally as others have said there are LE alternatives, but to be honest they aren't perfect either and if your a plug-and play type of person they can be troublesome as well...