I was hoping you would go with a MIPS64 architecture rather than the MIPS32 as 'leap' over the current bunch. Also no SATA? Network storage is ok but local SATA for an SSD would be nice.
I've only used the A10, which is $42, but single core, no flash, no analog audio jacks, and for some maddening/expensive reason, 0.05" headers, instead of the 0.1" on the A20.
It's a little behind the bleeding edge of Linux (still at 3.4), but I've been able to port an app from a beaglebone black to this with virtually no headaches. In fact, it's been nice, since there is no device tree at 3.4. Best of all, it's readily available, unlike the BBB.