Help me decide which armor to upgrade to.
Helm: Sunset Stretson (UVS Freeze Low, Shock High)
Armor: Ash Tail Coat
The upgrade paths that I'm thinking about are these.
Pure Pierce (Skolver and Justifier)
Mixed: Sword Speed (Vog and Justifer) or Damage (Skolver and Nameless)
Pure Elemental (Vog and Justifier)
and if it helps, weapons:
Swords: Avenger, Dark Thorn Blade, Silent Nightblade
Guns: Gigawatt Pulsar (Almost a polaris! :D) Shadow Driver (Might replace this with Sentenza if ST becomes pure shadow) Magnus (My least used gun)
Typo: Pure Elemental would be Vog Cub and Nameless, not Vog Cub and Justifier.
I always advise new-ish players to build a general-purpose armor set first. So I vote for Vog Cub and Justifier or Skolver and Nameless. You'll end up with normal, elemental, piercing, either fire or freeze, and two offensive bonuses. (You're still missing shadow, shock, and either freeze or fire.) Between these two sets it's a toss-up; fire is more important than freeze, but damage is more important than speed, at least on your latter two swords.
One you have a decent general-purpose set, then you can get additional pieces, to build more specialized sets. For example, Vog Cub with Nameless would be somewhat better for FSC. Consider also Vog Cub with Deadshot for FSC?