They are all very lovely, the small and teenytiny ARM boards that are available these days. I have a bunch of my own, a Raspberry Pi A and two Bs and also a BeagleBone.
But, what I'm wishing for is a ATX or mATX board, that would fit into a standard ATX case and use preferably a standard ATX power supply. And have 4-6 SATA ports and DDR1/2/3 memory expansion sockets. I couldn't care less for HDMI or GPU. And of course be affordable, like the tiny ones. Basically something like this, old EB110ATX board, but a modern version with a more current CPU and expansion.