For what its worth - compositionally Golden Dawn is probably technically the best. Subjectively, they're all really good and I can see why you'd have trouble choosing one.
But to be specific - I personally would crop the lefty of the frame (the sun) out of :
"Untitled Sunrise"
because its not needed, and its distracting and my eye is led out of the image
Just put your hand up to block the left out and you'll see what I mean
Same for:
"Sunrise 2-7-11"
But I would also darken down the bottom left to keep the viewer on the splash of the wave.
"Aqua Wave"
I'd darken down the left side of the water - again containing the viewer to the horizon, what you "want" the viewer to see.
"Concrete Lines"
and
"The Gorge"
Both good, but not standout enough (in comparison with what you have) - the others are stronger.
Which to me leaves Golden Dawn as the strongest image in its present state. HTH