Im assuming you are pretty settled on those rates but just for anyone else in the future who reads this, I went with 400f/400r and it is pretty damn stiff. It isn't unbarable, but you feel eveything, not so much little cracks and stuff like I thought, but any dip in the road that you wouldn't even notice before now feels like a bump. For everyday driving it actually makes you slow down because of all the bumps.

Unless you have some specific goal in mind that you need your car to handle well for (like auto-X or track days) I would suggest picking something something between what i have and the rates the GC ship with. Good tires, bushings and the normal GC setup will give you more handling than you will ever want to explore on the street.