I can't comment on KYB's but I bought the Bilstein's front and back for my car and nice are nice and stiff. Car rides very solid with those and welded in subframes.
Another +1 for Bilsteins. I was shopping around between the combo you're asking about, went with 04 Cobra takeoff struts and MM valved shock absorbers and am EXTREMELY happy with my purchase, one of the best modifications to the car in my opinion.