What keeps me wondering is, what gfx card? Unless that nVidia bounty opens on TeamAROS and a dev takes it on, I don't see the major gfx OEMs as reasonable choice for a AROS-1.
If you don't use VIA's mini-itx gfx card I think that the best idea would be to support Radeons.
I think that a fan-less mini-itx VIA board would be great for AROS.