Hi Carol,
Welcome to the Cathe Forum!
I was never a Firmie, but you already received some good suggestions from the others.
I will just tell you what my favorite Cathe videos are and why so you have some further insight:
1. BodyMax ("BM"): a 90 minute very tough tape with a step section first, then a step/lower body weight circuit section, then an upper body weight section. This tape is very tough and you feel so accomplished when you are finished. I can be broken up into two or three days if you are short on time.
2. Maximum Intensity Strength ("MIS"): This is a a 70 minute total body weight training video using a traditional lifting style of 2 or 3 sets of 12 to 16 reps per exercise. I feel I get a cardio benefit from this video during the legs portion (about 30 minutes).
3. Interval Max (IMax): I have a love/hate relationship with this 60 minute killer step/plyometric cardio video. It really kicks your stamina up to the next level.
4. Circuit Max (CM): This is a 60 minute circuit workout with compound exercises (lower and upper body working at the same time). Cathe does 6 5-minte cardio cycles followed by a weight training section for each upper body part and then puts a few more upper body exercises in at the end so that all muscle groups are worked, followed by some plank work for your core region.
Those are my favorites! I do, however, truly like all of Cathe's videos (I have all of them) and use them all (just some more than others). The new pyramid videos are really great. They are my favorites from the new series. IMax2 is also very challenging and fun, but not (in my opinion) as difficult as IMax.
Good luck.
Linda