No experience with the VIA boards, but I have deployed pfSense on a few
ALIX single board computers and been very happy with them. If you don't need GigE, anyway - they can saturate 100mbit, and only a couple watts. Cheap too. Not sure what it's worth to you, but these NICs are less than well regarded around the pfSense forums, and I've seen many reports of early failures with Jetway ...