love the shot and subject. If it were mine, I would layer the two together and reduce opacity to allow the color to show through a bit, then bring back all the color to the foreground with the eraser brush. In other words, i like both, but would prefer the color with reduced saturation to the bg, and perhaps a bit of bg blur added as the dof is a bit too much. I want the emphasis on this to be on the signs in the fg, with the bg as suggested environment. . .
good as it is, just my thoughts for improvement.