Please stop the bickering on the CC plates. I have been over this a million times. They make your strut mounts stronger, and give you better adjustment of the Caster and Camber. The drop amount that makes them required is somewhere around 2". However, that depends on your car, some cars are a little farther off, and require them at the 1.5" drop range, but this is pretty rare. A good shop will have no trouble aligning your car at 1.5" drop.
CC plates are REQUIRED, bar none, for Coil Overs and drops OVER 2".
Any less than 2" is dependan't on personal preference and your car's situation.
Coil Overs place added stress on your strut mounts, so you need the added strength that the CC plates give.
This is all answered in my Guide. Please read it EVERYONE.