Hi! Thanks for the feedback (we thrive on it). I will continue working to see what else I can come up with. If you have any tweaks you would like to see (color, font, positioning, etc.), please let me know.
In the mean time, here's a great article by David Airey on what makes a good logo. It should provide you with some valuable insight and advice as your contest progresses:
http://www.davidairey.com/what-makes-a-good-logo/.