i am currently in the situation that i have the energy left (i bought 3500 ce) to upgrade 1 more piece of my equip to 5* but i have 3 parts that need upgrading.
my current set up is
Divine avenger
Callahan
Biohazard
Storm driver
wise owlite shield
ash tail cap
ash tail coat
what i wold like to know is that should i upgrade my shield or get the fire resist of a vog piece.
my main stile is to use a sword for a small number of monsters and a kite and gun stile for large groups (situation dependant)
please note that this is for fsc as i can breeze through jk runs and most of the rest of tier 3.
i have already done fsc in this kit (but all the guns where 4*) an made it up to Vanduke
so: shield or fire resist
thats actually enough money to upgrade 2 items imo, i'd say go for dual vog, keep in mind you're going to lose your piercing defense when you do this (makes slimes/spikes more dangerous)