I like the processing on the first one the best, just seems like the best balance of exposure and contrast to me.
IF this were my picture, I think I'd probably crop it at the top to (barely) completely remove the sky, and then crop it on the left so that where the road fades off into the distance is at the very edge of the frame. For me, I think that brings the focus in on the workers a little more, while still giving a sense of the long path and all those grapes behind them.
I'd also get rid of whatever those white things in the road are; it looks like you removed them in the other versions (although I didn't view any of the others full size).