Suggestion: Since you will be making the final selection anyway, how about putting just the ones you like in a post and numbering them so we can vote on them. My vote goes to the last one in your post, that is slick!
I have a suggestion. Now that you know there are some good logo designers out there looking for a challenge, how about another contest but this time design a new logo for iHub to replace that dull boring unimaginative one at the top of this page?