The third one is by far the best! Yes it may be a little cliche, but who cares? Sometimes cliche is good, and in this case; it's definately better than the rest.
In the first shot the water is blurry, but not enough to impress a sense of motion. It just looks like it's out of focus or suffering from camera shake.
I've never been a big fan of water shots where the water is frozen. It sucks all the life and natural beauty out of the image. Water, especially in nature, is supposed to be flowing and lively. This just looks like plastic, and with such low light - dull.
In the final shot, the water is flowing, it's alive. There's a glow coming from the stream which brightens up the picture and gives it purpose. Plus it moves your focus through the picture.
Good work - pick #3!