Lasers and post processing

I've started doing some experiments with post processing and I've begun creating a system to apply those effects to our game. I've also been trying different ways to redo the laser system, since the old system was very expensive to draw and update each laser. I've been trying to find out if it would be better to use a billboarded sprite or an invisible 3D model (a locator basically) with post processing blur. I haven't been able to find much documentation on 2D post processing, so I'm leaning toward the latter but haven't yet implemented it.