Ok, this top one's my favorite. I like the negative image representing the ES and the circle representing the online. This use of the negative space is a powerful tool as it gives me one more way to pull in the observer. The yellow (for power and strength) portion of the image represents the ying/yang balance of business. The segment missing from the left ying is part of the E and leads the eye to the right to see the name of the company. So clear, so clean.