I'm gonna beg to differ here.
If you are used to doing Cathe cardio, like Step Blast, Powermax and the Imaxes, you will be bored and singularly unchallenged by the three videos you mention.
I found Step Jam to be, quite frankly, awful, dated and embarrasssing. Hated the music, the moves and awful arm gestures. Sold it off immediately.
I kept Step Heat but I do it less than once per year, using it only as a come back tape for times when I have not done cardio for several months and Step Blast would kill me.
I do not believe in owning Cathe workouts for either nostalgia's sake or for the sake of "owning them all." There's no point and it wastes precious money best saved for her next pre-sale.
With respect to your friend, perhaps the new beginner's/intermediate Step workout with added weight training would suit her best and allow her to work on choreography as she improves her fitness. After those, I would take her straight to the Cardio Hits, Step Fit, Powermax and Step Works, in that order to allow for increasing complexity and cardiovascular challenge.
Clare