How much are you lowering by? If by 1-1.5", then springs. If you plan to go lower, it can reduce your OEM shock life, so you have to get either lowered shocks or go coils.
Eventhough ppl say go for coils only if you are tracking, I disagree. Coils like Tein SS are actually too soft for track and are actually better for street and more comfortable than a silly superlow King spring + OEM shock combo.
In the end, ask your self how much you want to spend. Put a number to your budget (including alignment, camber kits and installation costs). Then you can see what options you have. I'd go for Tein SS + camber kit if it was for street.

