I like #1 and #3. I like the idea of the gears but my only concern is that it makes your business name a little harder to read. Your name is very clear in #3 and you could use the little symbol on its own as an avatar or for a favicon.
I agree, that symbol would look really good as a favicon!
I am sold on #. I love the idea of the turning wheel - that seems to bring out optimum efficiency. #1 also seems to spot on with the design rule of alignment....which makes it scalable and readable in one glance