I love Power Circuit; haven't done it recently but I may have to poke it in in the next two weeks.
One thing I love about is that the last 10 minutes of the cardio segment is step-kickbox, a variation I dearly wish Cathe would do more of. And, the music that kicks off (sorry - couldn't resist) the step-kickbox segment is so pnemonic it stays in your brain for hours afterward, in a good way. Kind of a driving, Celtic rhythm and melody.
A-Jock