What's your budget? What are you looking for with respect to improvements?
Have you inspected (or paid for an inspection) to verify the current health of the suspension system?
Probably the easiest "bang for the buck" change that will have the most dramatic effect on handling are the shocks. You can eliminate the FX3 shocks for about $300 if you go with Bilstein Sports or HD's (non-FX3).
You can also upgrade the brakes to C5 style or an aftermarket kit, but unless you're reaching the limits of the stock brakes, it doesn't seem to me that you'll gain much in the feel of the car.
Tell me more about what you want to do, and we can give you some advice!