What's the best suspension for Street Handling?

I am not looking for an old mopar to handle like a sports car, I am just looking to get a noticabley nicer, more performance than stock handling A-Body that will be fun to drive.
There are a lot of old, worn out parts in my Dart and if I am going to replace them, I want to upgrade it and make it faster. All the information you guys have provided has been great so far and very educational for me. I have never tackled a project this big and don't want to spend money where I don't need to... like in leaf spring sliders (thanks autoxcuda for the good experience info on that one).