nbp

Hi, I drive an IS220D sport with 18" alloys. The front are 225/40 and the rear are 255/40. Does anyone know what the best winter tyres that would suit the car are? I guess the best thing to do is purchase a set of wheels for the winter tyres. The manual for the car suggests that the car is not suitable for snow chains. I have, however, purchased a set of chains which I've never used. I'd like to be in a position to put snow chains on the winter tyres. Can anyone suggest a solution?