If you only want that small of a drop, your best bet would be the Eibach Pro-kit or the TRD springs which are just the Eibachs with a TRD printing on them. I believe the Eibachs are cheaper though. These springs drop the car about 1.25" all around.
If you plan on getting coilovers, then get the Tein SS coilovers. They are cheaper and better because the dampening is fully adjustable where as the TRD one's are not.