I always choose between Stone Curse and Frost Diver, but I don't find those that useful for a soldier build, because we're more DPS dealers than nukers and the debuff goes anyways with the first hit. I prefer to use Fiberlock and Blinding Mist to keep people nice an quiet, if I want them to stop hitting me I just lock them and move, or Mist myself so their skills miss. Fiber Lock works too with the damage increase as Stone Curse, so that's very nice.
The problem of those two skills in PvP is that everybody carries anti DB/freeze gear. People with a fire elemental armor and Marc, and stuff for Stone Curse is not hard to get either, you can even combine those switching to a Medusa carded shield and voilà, inmunity to both states. For Fiberlock, there's no real way to avoid unless they have a skill to hide/move, like snap or Hiding, but if they use those, they can't attack you till they come back, where you can lock them again. xD
About the insignias, I don't really know. People think they're awesome, but I don't know where to get points from, and I've never tried them as to make a judgement. They seem to be incredibly good at MvP, as they get very high damage reductions and boosts, but as I said, I don't really have many points for them. I prefer to have three summons than getting one or two insignias, because I really, really like summons. xD