Hi Purplesky1120,
I am relatively new to Cathe compared to most of the crowd here, but I have all three dvds, and they are all good so I feel that you wont regret buying any of them, however if you are like me with minimum time on your hands and want to get in a full body strength/endurance workout at least twice a week then I would go for the power hour,Mis and bodymax dvd as it has three full body workouts and loads of mix and match possibilities.
Power hour is a all over body muscle endurance workout, Mis is a full body endurance/strength workout and bodymax is a cross training step aerobics and endurance workout, and has a circuit section in the middle, (educated crowd can chip in if I am wrong)these three workouts target all the major muscle groups in one session.
Pure strength and slow and heavy have three workouts each on dvd that work around two or three body parts a day such as chest and back, or strong legs and abs etc, so you may end up working body parts once each per week at the end of the rotation, but I suppose you could do more than one of these workouts in one day but as I said it might not be time efficent if you are like me, however I love all these workouts and this is just my opinion.
hotchick