Shoe recomendations?

I am into group fitness, i do anywhere from 8-15 hours a week in step, kickboxing, pilates, spinning, etc.....the shoes i have now are just a pair of athletic looking sketchers that i have had for almost two years and have been wearing for almost two years. i have known for a lonnnnng time that i need some real shoes but never wanted to spend the money until now. i am having serious pains from and when doing cardio, specifically step and running. i need shoes that are really good for what i do and are meant for what i do. any suggestions? i will be going this weekend to get some new shoes. thanks!!!