#10 so far is the cleanest in my opinion, nice work. The hybrid person/check mark can be used as the favicon so that was really smart. The green check mark is very positive. The letters are very clean and simple which is preferred. Would be nice to a very simple signature font element that does seperate it from a standard looking True Type font though. Just one character or style element added to make it look somewhat customized. I do not want the slogan included in the logo, so that was smart to leave out.
Is it typical that only 16 entries are submitted for a potential logo? As the days roll by, will more people join this competition and submit additional logo ideas?