Most of the suspension parts are interchangeable anyway..

I'd say eibach's and konis are a good start, and driving lessons/autocrossing to learn how the car really behaves. After driving my car for almost a year with that setup, I would never go back to stock... It makes the car feel much more planted and reduces body roll while giving you adjustability for different conditions. There are plenty of threads regarding this setup, search for eibach koni and you should get enough info.