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?!?!?!  }(