Hi,
Thanks everyone for your comments.
Mike -- did you have anything in mind for how I might process the third one differently?
Pop -- the B&W conversion is interesting. I can't remember now if I tried it at some point, but in general B&W isn't something I've played with much, and I strongly suspect that if I did try it, it didn't look as good as yours.
For comparison, I tend to prefer them first, third, second, although it varies a bit from day to day. I agree on the problems with composition for the second -- I clearly remember getting back from the trip and starting to play with the files and being very disappointed that I couldn't find a really satisfactory crop for it. It starts to come into its own more at larger sizes, where your eye is responding less to the overall composition, and it's easier to get lost in a feeling of being there.
Sadly, none of these files hold up very well at larger sizes, due to a combination of low-end camera, lenses, and probably careless technique. But since I'm upgrading equipment, I thought it would be good to get some critiques and see if I can simultaneous improve my photography.
Thanks again,
Brian