Maybe you could try the PS series and do cardio on the days in between. I like the PS series a lot. I've also tryied a rotation where I did a Firm (sculpting) or Fitprime video on MWF and Cathe cardio on TR. I got nice results with that one. And I didn't get bored since the workouts where always different. I used Weights First and Core First and several different cardios.
How did you like the CTX rotation? I love all the cardio workouts in that one. Isn't that LL fun?!?!?! }(