Jeremy, I'd have to go with the color version. The problem with the B&W is that the branches in the foreground become too dominant without the color glow in the sky. Don't crop anything. You need the reeds at the bottom of the picture to give the viewer's eye a stopping point. Don't worry about the "rule" that the sky should be brighter than the water. That "rule" may be true in some cases, but Monet, among others, has demonstrated that it's not really a "rule." Depends on the picture. In this one it's exactly the way the world works at this time of day.
One thing that gets lost in the color version is the north country evening haze hovering in the background vegetation. If you're going to manipulate the picture at all you might bring that up a bit, though if I were doing it I'd be about as cautious as a brain surgeon at work.
All in all the picture reminds me of night coming on over a trout stream in northern Michigan where I spent my summers as a kid. Very nostalgic image for me.