I love X-10 for cardio. The variety and challenge is always fresh. I find it tough, but doable, and I can change it up so much (streaming video isn't doable here so the blender is but a dream). A workout along the same lines would be great.
I would love a all out X10 Reloaded...lol...along those lines. Intensity as well as Crossfire ....KPC...these are some of the best...challenging and you know you've worked!!