They're all pretty good, but they have too much randomness to them it seems. There are little interfaces floating all around with little tidbits of stuff in them. Also, I don't like how you blended a render with the wireframe, it looks kinda bad to me. The DNA piece has the most potential to be awesome, but it's far too busy right now, with the foreground and background renders. The text is bad on it too. Work on it, and it will be far better.