Since you are asking for suggestions for all 4 workouts, I've been trying to figure out a set-up that would satisfy a wide range of your audience.
Since the high-impact, intense-step lovers haven't really had as much of the kind of workout they want for a while (except for IMAX2), I think it's fair to include 2 intense step workouts in this batch (then, in the next batch, you could include some intense step at a bit slower pace, like in Cardio and Weights, but with more modifiable moves (I HATE with a passion---sorry!---my KNEES hate with a passion, moves like figure eights and ricochets, but it's hard to figure out a more straightforward but still intense substitute for them). Getting back to this batch of workouts, you could put the two step workouts on one DVD (I think only in terms of DVD these days
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For workouts 3 and 4, I REALLY like the idea of a push-pull workout, not as slow as Slow and Heavy, but about the same rep speed as PUB/PLB or a bit slower, and a TRUE push-pull, which to my mind, is a set for chest followed immediately by a set for back, repeated for a total of 2? or 3? times. Of course,it's hard to figure out a home exercise that will act as the opposite of shoulder exercises.
A good pairing with this workout would be (and I'm repeating myself here, so , yes, you have heard this suggestion from me in the past:+), a moderate-weight, weights-only circuit (not including cardio) that cycles through several segments of chest/back/shoulders/legs/abs.
Though I'd like to see a follow-up to Cardio Kicks, and Boot Camp, and CTX (if the cardio is as described above and includes more variety), and, of course, Slow and Heavy, and yeah, why not PLB/PUB, I think it's nice to have something new and not just a rehash of the previous videos. It would be nice to see a Cardio Kicks2/Bootcamp 2 DVD pairing in the future (with the addition on DVD of kickboxing segments from previous videos), but since Bootcamp just came out, it's too early IMHO to be doing a sequel.