Either HISM or Step Sweatfest is awesome, IMHO. I really enjoyed Step Sweatfest--the first half was killer with her intervals (slightly different from Cathe) and the second half was just pure fun. MAKE SURE YOU PREVIEW THE SECOND HALF BEFORE ATTTEMPTING IT, THOUGH! There's no breakdown so you'll end up incredibly frustrated if you don't watch it first.
Allison