You have a few options, the Ground Control kit is very decent, it uses Koni adjustable struts and Eibach springs, the Bilstein PSS kit is also very good, I have it and I love it. Stiff yet streetable. Then there are the others, KW, FK, KYB, etc, etc.
"Driving is like a narcotic, an addiction that can take over lives. It ruins people, breaks families apart, and even kills. Itís habit that needs to be fueled. Time, money, rationality, sweat, knuckle skin, and anyone who disapproves are of little importance to a driver, and are often overlooked. Hi, Iím Nelson, and Iím a drivaholic."