I have a 2000 323i with sports suspension and have 16" v-spoke wheels on all four. I would like to upgrade my wheels but I am not sure if I should go 17" or 18". I am leaning towards the 18" but I heard that this type of wheels are hard on the buns coz you feel every indentations on the road the car travel. Is this true? I like to profile in big wheels but if the 18" is too much as mentioned by some of the people that post here, I would rather have the 17". I just like to get several inputs from those who are already in the know so that hopefully, I can make an informed decision when I buy my wheels. Your comments are very much appreciated.