Although very nice, none are sophisticated enough. I also don't like script fonts, or logos on an angle sliding away. Can you do a version thats straight on and no script font? Also, Las Vegas seems to be getting lost.
I like #16 the most, but can you straighten out the "las vegas' and the tagline to read straight on. I don't think they should be tilted back. I think with that change, I could like it a lot.