Cathe is one of the few to put out a good, advanced kickboxing w/o on DVD in a while. I would love something along the lines of KPC. My suggestion is to include more simple kickbox drills that keep the heart rate up and combine punches and kicks well. Add to that some great music and this would be a winner.
Kick Max scares me because of all the high impact. So how about a straight-forward, mostly low impact routine with lots of punches and kicks, and set to awesome music?
Cathe, I know you have a lot going on, so just put this on the back burner for now. When you're healed and looking for new ideas, just know that your fans would jump all over this one.