I think just getting rear camber arms are fine...

 

According to Z gods on site, they claim that anything over 1" will need camber/caster corrections. However evaluate them yourself with drive control, feel and tire tread wear.
Whether you use coilovers or spring/shock combo's, a drop will need these corrections....assuming you want to bring it back to factory settings...

 

damn, the tokico/Tanabe set-up looks pretty good. I think I might be going this route.