Top 5 are MANDATORY.
Middle 5 are HIGHLY RECOMMENDED in descending order of importance.
Bottom 5 are optional picks or suggestions.
EMT Bag lets you heal 3 hp, 1.5 temp hp, and 1.5 hp to nearby teammates, PER KILL.
Scar Tissue reduces common damage significantly. Think of it as +1 hp healing.
Spikey Bits, armor and additive bonus damage.
Mean Drunk, cleave.