Sorry if you are tired of people bitching about Allwinner and Mali but I was just looking at the new SolidRun and TechNexion i.MX8 lineup of SOMs and boards and was just feeling inspired ;) If you haven't seen them please check them out.
Both seem to be able to produce at a pricepoint sightly higher than the current OLinuXino/TERES-board lineup, and I personally (not that it matters much) would pay twice over for a fully supported SOC.
The problem I have with both is that they are not EU companies.
I hope you are aware that fully open-source Vivante support is miles ahead of anything Mali and has been for while.