OP, Eibachs are definitely a great way to go for lowering springs. They will lower your BRZ 1.0'' in the front and 1.0'' in the rear. Here are some comparison pictures:
We have a great deal going on some
Subaru BRZ Eibach PRO-KIT lowering springs, give me a call at 714 582 3330 ext 8003 if you have any more questions
-Frank