Addco also makes a set of bars. There are plenty of options out there, but you don't necessarily need to go with the stiffest you can find. Remember, stiffer bars actually REDUCE grip without changes to anything else and will somewhat effect everyday driveability, so you have to first decide what you're doing with the car before you pick the sway bar set and suspension you want.
http://www.addco.net/Plymouth-Susuki_AntiSwaybars.htm#Porsche