Good HIIT workouts???
Try Power Challenge, MAX Tabata Test, Cut and Chiseled they're short but tough. Or you can try my workout 20x10 if put it together from some of the exercises I found here and at ab-workouts-guide.com. It's intense but I like it because it hits every area of my body (arms, back, abs, butt, legs, calves, etc.). Good luck and God Bless!