I like the #54 most of your designs. however I don't like the dot between the slogan and URL. Think it's getting to "heavy". If you have more ideas out of #54 please let me know.
Here is another verion of the same design. I like these designs coz of their simplicity, elegance and class. I tried to put the wave comming out from K since its making the deisgn more elegant. Thanks , Sandhya