I am getting ready to purchase my first real pair of tennis shoes. I have been using Nike Cross Trainers. If the Adidas Barricades fit me well, that is the shoe I am going with. I went to my local Adidas shop and the have Barricade II in regular and mid, Barricade iV and Barricade V. What are the main differences? Also have you found one to be better than the others?