model A: 3 NICs, no audio, no video, no SATA, aimed at firewalls with DMZ
model B: 1 or 2 NICs, again no audio and no video though a minimum of 2 to 4 SATA ports to be used as NAS/server machines w/software RAID etc.
model C: more powerful CPU, just 1 NIC, audio, video and 1 SATA port to be used as a client/MPC etc.
Would the higher cost of producing 3 specialized boards exceed the benefits of making general purpose ones where for example a powerful and costly GPU is left unused because the user had no alternatives to consider for building his file server? I for one would seriously consider purchasing the first two (as I did with other pcengines.ch firewall boards in the past).