I would stay away from vinyle on this house. You have a natural setting there and if it were me I would cedar side the whole house. If I was going to do stone I would stone the whole front and chimeney, I think just doing the half will break the front up and it would look unbalanced. You could stone about 3-3-1./2 feet up from the ground as a accent and this would also take care of the cement on the front.
It would be nice to see some pics of the other sides of the home.