The first set is a grid-based design with hierarchy within bigger squares.
The second set is based on a left and right scrolling page with information scrolling vertically.
The third set is another grid-based design but more open and less about drastic heirarchy through different-sized squares.
I ended up going with the second set to take further. I was drawn to it the most of the three. Marty commented on it saying that it felt very ipad-like which I completely agree with. But why can't we take the sleekness of ipad design and apply it (successfully) to website design for a computer?