I agree with *** that the shocks play the biggest role in what people describe as "stiff". Once you turn up the damping to the point of the it being an overdamped system(from a spring-mass system point of view), any inputs to the system, in terms of movement, get damped out very quickly. Springs make a difference, but I also know from playing with the Koni's on my dodge shadow that you can crank them up to way overdamped and it will feel far more "stiff" than it real is.
blitzkrg-RS, how is the setup over bumpy/ripples in the road. Like I said I done mind real stiff feel as long as I'm not skipping over the bumps; the tire still needs to be in contact with the road. Where exaclty did you see that price? Tein's US site?