#6 - I really do love this logo. I'd like to see a couple of variations. One with thicker lines on the paper clip and bolder font on "Business". The logo has very good balance so I'll leave it up to you how to keep the balance that it has going.
Then another version where the letters are spread apart a little more to let the design breath. It seems a bit tight.
May concern is that on a business sign, the logo's fine lines might not be visible from a distance. I really do love the look. Great job.