So, I've got all 4* gear and am starting to save for 5*. Was hoping I could get some advice on what to get, since it's going to take some time and since I'm a free player I don't want to waste any CE. Anyway, this is what I've got right now, please give me your thoughts.

Silent Nightblade - probably upgrading to Acheron
Avenger - probably upgrading to Divine Avenger
Silversix - probably upgrading to Argent Peacemaker but considering Catalyzer or Pulsar lines
Freezing Atomizer - have Shivermist recipe, almost certainly going with that upgrade
Ash Tail Coat and Cap - probably upgrading to Vog Cub or Skolver
Wise Owlite Shield - probably upgrading to Grey Owlite

Any thoughts on what would be the most useful gun for me to go with? Also, for armor, I know piercing damage is becoming more common. Should I get one piece of Vog Cub and one Skolver to cover both that and elemental? Or change my shield to something else?