On my Fleet Defiant, I always slot:
I will swap out cloak and another science console for the following (depending on what I'm doing):
Vent Theta Radiation
Consoles I'd like to pick up some day:
Resonance Cascade Modulator (Team Fortress)
The Zero-Point Energy Conduit is nice if you don't have high critical hit. If you already have a high critical hit, the Zero-Point Energy Conduit doesn't add a lot. And the power increase usually isn't enough to get worked up over.