Katie,
HC#1 is a circuit workout of intense cardio and weights. #2 and #3 are very intense interval cardio workouts, although #3 has the leg conditioning drills from KM tacked on at the end. For #2 and #3, just sub a very intense 70 minute cardio workout.
For HCE#1: SB/SJP premix #5 - Step, Hi/Lo & Weights Circuit (85mins); OR SB/SJP premix #6 - Step & Weights Circuit premix (81mins)
For HCE#2: Step Blast (or a 60 min cardio workout that you find rather intense, preferably with some intervals in it), then tack on Boot Camp cardio premix; OR just do MIC.
For HC#3: Cardio & Weights warm up; step combos 1 & 2; IMAX2 blast-only intervals 1-5; CW step combos 3 & 4; IMAX2 blast-only intervals 6-10; floor work from either PLB, GS Legs, or LG.
Hope this helps!
Sandra