Naga has a Khd too, plus surprise hack attack from marker state without need to cast cybermask. Also he starts closer to the objective because infiltrate. I have Scylla converted with a bsg and I really like her, just haven't found a way to use her correctly in my lists. As for the peacemaker, you absolutely have to own one, especially for Acon. These guys shine in combination with Nagas and Montesas, but can cause mayhem even alone if opponent leaves a weak spot in DZ defenses.