[@Asura] Well, we have two standard all-purpose Battle-Sisters, a Hospitaller for medic duty, and a Confessor whose focus is short-range firepower. We currently lack Dominions and Retributors, the former working as vanguard shock troops and the latter as heavy weapon users at both long and short range. For the purposes of this game, and considering a present lack of mechanised opposition, I imagine a Retributor would be most useful, if you give yours a heavy bolter and a heavy flamer to handle infantry at the corresponding ranges. Really, though, either would work for the game's purposes.