I have the opportunity to buy some new Cathe videos from someone. Here is my question. I am considering getting the CTX series for a mothers day gift so I want to know if these others ones would be redundant once I own the CTX series or would give me additional workouts outside of the CTX series. Also, currently I own the Wedding Tape, rythymic step (which I love but still can't get the third section down - any suggestions here would be great too!!! Have done it now 4 times and have the first two sections nailed but get so stuck with the changing of feet on the shuffle down part on the third section!!), and Circuit MAX. The series I can buy are MIS and MIC, Power Max and the PS series. What do you all suggest? Thanks, Sandy