I've heard the blues are equivalient to the Illuminas 3 or 4 setting. The higest is 5 on the illuminas and it's not nearly as stiff as you my friends Koni yellows on his civic.
I'm not talking out of my ass about comparasion because I have the Illuminas on my car
If you want stiff why not check out the Koni Yellow adjustable. They will run in the $580 shipped range or go with the non-adjustable bilstein SP. I've heard that they are much stiffer than the illuminas on their 5th setting. you can get the bilsteins for around $480 shipped.