I am new Cathe.com and I have seen Cathe's workouts on FitTv and love them. I was wondering if anyone can suggest some "must-have" DVDs to buy. I am interested in Body Blast Series - Step, Jump, and Pump + Step Blast; Hardcore Series Imax 3; and Muscle Max. I love challenging step routines and muscle sculpting workouts. I would love to hear from you!