DC-Be very,very careful when attempting power cleans.Especially the first couple of times.Ideally, you should seek out a qualified olympic lifting coach to teach you the form, as they are a very complex movement.Quite a few people have been injured doing them.If you do try them, use very light weights(initially) and focus on form and speed rather than poundages.
Power cleans heavily involve the leg muscles and I usually do them on leg days.The wide grip deadlifts seem to hit the traps better, and I do mine on a platform which increases the range of motion, which hits the legs better.This has been my primary leg exercise, but I've just begun back and front squats, so these deads are taking the backseat for now.