> I didn't know about WonderMedia

The VIA APC you linked to has the WM8750 SoC. In order to reflect the VIA connection better, the WonderMedia SoCs are sometimes called VTxxxx instead of WMxxxx.
Some discussion on the 8505, one of the predecessors of the 8750 (just FYI):

https://morph.zone/modules/newbb_plus/viewtopic.php?forum=3&topic_id=7001&start=345

> It was good to see an eSATA port on one of those ARM boards

The VIA APC has eSATA? Btw, ARM machines with SATA:

http://trimslice.com/web/models
http://pogoplug.com/devices#pick