the TEIN RE racing suspension with double adjustable damper is great, I tested on several highways (remember: in Germany the roads are also in poor condition)and on northern loop.
You can adjust damping force in 24 steps,
best for my way to drive is +10 front and
+12 rear. I use springs with 100 kg in front, rear 120 kg per 1 cm.
1 inch = 2,54 cm
1 lbs = 0,446 kg
If you dont wanna test a lot and wanna use a suspension system with all posibilities buy this system.
Mark Johnson from Dali Racing have them in stock, also an installation guide.
If you have more question, feel free and ask me. I have many experience with this stuff.