King springs and kyb gr ride quality?

My 2011 Impreza needs shocks badly. I'm thinking of swapping king springs also to help out when we load the car up. Are the king springs firm enough to make the ride harsh,.or are they marginally firmer? Anything is better than the worn out stuff on there now, but I can't get to sporty. Other option I'm considering is the loaded Monroes. Thanks.