Tokico Illumina series are very good and they are adjustable. A lot of guys that were running Porsche 944 in SCCA racing were using them. They can be adjusted for street and track performance by the 5 way adjustment. Really there are a lot of good shocks/struts out there like the Koni so it just really depends on what you want to spend and your needs and wants. I would suggest getting something you can adjust easily so you can tune your car the way you want it to handle.
Your tires can make a big difference in how your car rides and handles. All your suspension works together so changing one thing will affect everything. Not sure what you are running for tires and wheels but usually running low profile tires will give you a more harsh ride as the taller/high profile tires take up some of the shock.
Here is a link to the Tokico Illumina series,
http://www.hitachi-hap-la.com/Tokico...ina/index.html
Al