I like entries 7, 8 and 9 but can't envision how it would work well in the context of a business card (where the card stock may be white) or as a logo in the footer of a web page. It seems to me the halo, while a very nice design touch, doesn't work well in our primary applications.
I like what you did with the "I" in #39, nice detail. I also like the fading from the black to the blue on the bird - subtle but noticeable. Do you by chance have any other renditions or styles for the bird?