I really like these suggestions. I actually used all of these workouts, with the exception of Low Impact Sweat to reclaim my ability to step.I have a few suggestions- most all can be broken up into segments to learn the choreography & most all are lower impact.
Cardio & Weights (includes IMAX2 on the dvd)
Low Impact Circuit
Low Max
ICE Low Impact Sweat
and of course the newest Step Boss's Step Sync & IMAX4. Have fun!