I have been using Cathe's videos for just under a year and I would like to purchase my next one to add to my collection. I currently rotate through IMAX 3, MIC, Body Max and Body Fusion. I am looking for just a good hard cardio workout (still trying to lose pregnancy fat after almost 2 years--sweet tooth!!). After doing some research, the ones I have in mind are Interval Max, IMAX 2, Low Max and Step Blast. Does anyone have any opinions on these or suggestions for something different that I have overlooked? Thanks for the help!