This is a little bit more on the classicalside than the modern side, but it conveys strength as does your slogan, I read it and what I understand is there is strength in numbers. I chose blue and green for the colors since that is a more modern color for your type of business. I will be submitting some more in a few that are simpler, let me know what you think of all the designs that I submit, as it will greatly improve the chance of you getting the design that you are looking for.