My favorite that I've tried in the past was Cellucor SuperHD. Focused energy, not jittery, and works well.
Have some free samples of this, about 5-6 days worth. Haven't used it yet. Not really overweight, 5'11" 170 lbs. Just looking for something extra to add to my diet and workout. Have any other details about it? I had forgotten about it until this comment. I may try it now.