How much money do you have to spend on this, and how serious are you into it?
Meaning, are you looking to road course the car, or just have better road manners. Are you looking to just try and get a little more bite on the street, or would you consider moving the springs, cal-tracs, etc?
And, what tires are you running. best suspension in the world wont do much with cheap/hard tires under it.