I'm planning on lowering my car about 1 1/2 - 2 inches and i was wondering what else i'd need other than the actual springs?

 

You don't need anything else. However, a good set of dampers is always nice, as it will increase both your ride and your handling. And if you're getting near a 2" drop, think about a camber kit, or at least keep an eye on it once the springs settle in. Otherwise you can end up with severely reduced traction as well as ridiculously fast tire wear.