Force Multiplier is nice, but I like destroyer, it has a ton of good negative hacks. One of which does something like -50 CT, and -100rng/melee dmg
Also you could always load up that hacker, and have partial MA, or patcher on. There are tons of combos you can work with, just try the best one thats suited to you.
Also if your unsure, just go through the trees and see which would suit your style better before getting to involved and spending all your Info.