I'm not Marnie, but I can tell you what I have been doing and plan to do. I just finished 4 wks of SH.
My week always started with SH Legs and Shoulders, coupled with a CTX Cardio
Day 2 was SH Chest and Back coupled with a CTX Cardio
Day 3 was SH Tri's and Bi's coupled with CTX Circuits (I am trying to do a lot of legwork)
Day 4 was Cardio Kicks (a new tape for me!)
Day 5 I alternated--either PH or MIS--and the only day I did not do Cardio
Day 6 was a Step tape--I've been circulating Rhythmic Step, Step This Way, and Still Steppin'
I am about to begin a PS rotation for 8 weeks and will start with PS C,S,T and couple this with a CTX cardio; Day 2 I will just do PSLA; Day 3 PSBBA with a CTX cardio; then a full length cardio, either MIS or PH, and then another full-length cardio. I will probably do MIC, IMAX, and PowerMax as some of my cardios during this 8 wk. period, and I love Cardio Kicks, so I will continue to use that. I wish Cathe would do another CTX series. I love the intensity of those short cardio sessions and love to use them in these longer weight rotations!
Hope this gives you some ideas!