I have three videos that are in my current rotation that I just love:
Kathy Smith Step Workout, like you.
Gin Miller's Simply Step Classic Moves - 63 minutes
Charlene Prickett's Crazy for Step - 73 minutes
You can check out previews at
www.collagevideo.com
Gin's is listed as mixed impact, but it is actually very low impact. A few optional higher impact moves are thrown in but you can continue with the original moves with no problem.. the higher ones are merely optional.