Hi Nora,
I can only tell you about 3 of Cathe's step tapes. I have her Mega Step Blast, Interval Max and Step Heat. They'll all good. From what I have heard the cheography on these are more basic then most of her other tapes (which is why I chose those). From what I heard all her tapes are good. If your looking for a high intensity tape Interval Max is the way to go. Do you like tougher cheography, high impact or low impact? Cathe doesn't actually have any low impact, but some tapes are easier to modify than others. Let us know.
Dawn