Again, I am not sure I understand your original question.
Ryuji2 just beat me to it (I was replying to another post first), but you are better off using other armor as I said previously. Hadne-Kedar Armor will give you +40% (of base) weapon damage, and the Recon Hood will give you another +10%.
And if you want tankiness, then there are armor pieces (which manufacturer) + the Archon Visor which can give you a total of +20% shield regen rate and +30% shields. The Collector Armor will give you +20% shields, +20% health, and +20% shield regen.
Of the armors you show:
- The power damage applies only to Concussive shot, Frag Grenades, and any non-ammo bonus power you might choose.
- The melee damage bonus is small, only 10% so not really worth it.
- The weapon damage bonus is small, only +10%, so again, not really worth it.
- The ammo capacity (+10% or +25%) on that armor will not be really be worth it unless you are using a gun that is very poor on ammo and you are a very bad shot.
- The +25% shields is based off of base shields u so only adds +125 shields (25% of 500). Doubtful you notice that increase on Insanity. When you are out of cover you actually take +40% more damage.
Now, more shields are good if you take Fortification specced for maximum damage protection, but even then, I recommend more weapon damage (Hadne-Kedar armor) on the Soldier since the class does not benefit much from the other bonuses except headshots.
And as Ryuji2 points out, Cerberus Nightmare is better than Cerberus Shade on the Soldier since it has more weapon damage and headshot bonuses.
It should be noted that you can stack armor pieces to really enhance one stat, particularly: +50% Power Damage, +50% Weapon Damage, +50% melee damage, or +50% Power Recharge. There are a couple of others that provide some mixed stats like weapon damage + headshots + ammo capacity, or shields + shield regeneration.
Some of the full armor suits provide good bonuses early, but are soon eclipsed by the mix+match armor pieces if you really want to max one stat (weapon damage, power damage, power recharge, or melee).