Party Rockin Step 1 & 2 - Just plain fun & good music. I would do them every single day if I didn't know variety is important.
Step Blast, Rhythmic Step, Body Max 2 Step, 4DS Hi and Low Step, Cardio Fusion - also just plain fun. Fun moves, fun music. Goes by very fast.
IMAX 3 & The Terminator 3 workouts, Imax 2 - not so much fun as I just feel accomplished when done. This was Cathe's first step video I did, so also a bit of nostalgia for me. And it has the song "Tainted Love"!
Step Sync - easy and perfect for my "lazy" days. Fun moves.
Cardio Hits & Classics Volume 1 (6 step workouts total) - Nostalgic, steady state, full hour step. And gives a good laugh at the outfits (lace thongs).
Cardio Party and Cardio Slam - I just find them fun and great for easier days.
Step is my absolute favorite type of workout! I wish she would do more. There are also several LIVEs of step workouts that are really good.