Hi, please let me give you a valueable pointer, just a suggestion and help you might find useful:
If you click on a design you would like to comment on, something you would like to see changed or incorporated in, you will reach the designer's personal page where you can leave individual feedback. This feature is very handy, because it sends the designer an E-mail, notifying him/her, that you left a comment on their page. Speaking of that - feedback is incredibly important to designers - it helps them see what you like or dislike in their designs, what you want to see changed or incorporated. This way we can accomplish the best logo for your company in the fastest and most perfect way.
Also, when you comment into the personal designer page, the designer can actually answer. For an example, I want your answer your postings here, but I am not allowed by the rules.