If you're looking for stiff, I would probably recommend you going with an FK setup, koni's have adjustable dampers, plus you get adjustable height. You can't go wrong for the price.
My setup is pretty much good for me, its still comfortable, there's a bit of roll, but, considering my car is an everyday driver, I can't have the stiffness when I drive to places with bad roads. Its a good 50/50 compromise, more handing without sacraficing too much comfort.
The chip, yes, I did notice it, they say M30 motors get the most gain from a chip aside from the E28 M5 motors.