The camber kits will probably be needed for a drop of that height. For the front, I recommend Omnipower or Skunk2 because they completely replace the upper control arm and are easier to adjust. The Omnipower is a little cheaper, so you may want to look into that first. For the rear, I recommend the Ingalls kit. It is a good build quality and is simple to adjust. These camber kits will run you around $250, so you need to consider this expense on top of the springs/struts/coilovers.

Also, keep in mind that the car will most likely need to be aligned afterwards regardless of whether you buy a camber kit or not.