Very nice ideas.. #9 has some neat 3D effects built in.. Look at my main comment.. I think you could come back with a great idea.. Thanks for your contributions!
On #9 can you incorporate N and S in the image? Also maybe change out the orange for a blue color?
I would also like to see it with white and what you would do with a black background.. We like how you have the company name.. can you also submit a version with a few different font choices besides what you have now?