Today, I discovered the Compulab Utilite Pro which is up to 4GB ram, but only Cortex A9 and no real sturdy storage solution.
I also found the AM5718 SBC which seems to have almost everything on the paper (Texas Instruments Sitara AM5728 dual-core ARM Cortex-A15, 1.5GHz
NEON SIMD and VFPv4mm, Sata, 4GB Ram). Yes, only two cores, bummer! And one can't buy it just like that, there is no store whatsoever.
From the same vendor, there is also the SBC-iMX6 with NXP (Freescale) i.MX6 Plus quad-core ARM Cortex-A9, 1GHz NEON SIMD and VFPv3, up to 4GB of RAM and Sata. Yes, only Cortex-A9, and no way to easily buy it either.
But that's a good candidate anyway (until I get the real price I suppose).