I've had situations like this, usually a town hall meeting where I have scads of people voicing different opinions. Usually, I'll start with one NPC speaking and get the main points out, then I'll interrupt myself with a different NPC that heckles my first NPC, then I'll join in with another heckle, and at that point the players usually adopt NPC personas and start voicing different opinions. The PCs themselves actually don't get very involved unless one of my NPCs directly address them.
The truth is, there are usually only 3-5 different opinions and they are usually obvious Unless there's some knowledge that the players don't have that has to be revealed, they could probably just play the parts of different NPCs themselves. Just make sure you get all the info out that you want out, as well as all plans you want out.
Good luck!