I really like the wave-theme with the font - it's very distinctive.
The building you chose is a unique piece of architecture just across the river in Northern Kentucky - one of my favorites - only problem is... I think people may associate the contest too much with our neighbor. Could you try something that uses a different icon or no icon at all??
Is there anyway you could stylize and create more of a colorful/high impact version of Entry #2? I think the Union Terminal building is a great example of a Cincinnati icon, but I don't want it to be the focus of the logo necessarily.
I like the waves in the font because they're unique, but I want to make sure people can read it very clearly. Also - just FYI - it's spelled Cincinnati (not Cinncinnati). Thanks!!!!