Dude, those are SICK. I love the first one. Composition is very dramatic...happy, yet lonely. The high contrast is nice, and this is an example where sharpness throughout the entire frame is really something useful. One vertical line (the lamp post), but nothing perpendicular to it adds another characteristic of interestingness. The vignette is also a nice touch (post-prod?). I really really like that one.
The full-color sign is just a tad too green to me. If that was the effect you were after, alrighty then.
Nice work, bro! I thought you were looking for a D200? Looks to me like you've got one already!