I have heard good things about the Koni FSD. They are non adjustable, but they are supposed to auto adjust between agressiveness and ride comfort. I was going to get them this spring, but opted for the Koni Yellow when the FSD were on back order for 3 months. The Koni Yellow are a good choice too if you want adjustable dampening.
Sorry I can't help you much on the coilovers, I am pretty new to modding my mz3. I have just added swaybars and shocks/struts. Wish I would have added the springs right away too.