I really like entry #4. I need a symbol that ties together our other company in another state. All of our companies are in the Midwest. So the symbol I had in mind would tie together something with the Midwest. Someone at our office suggested a picture of the united states with a circle or highlight of where the Midwest would be. I like the colors and the font. However, the "M" in Midwest I would like to be a little less "rounded" at the top of the "M".
I like entry #5 as well, especially the "T" design.
The only issue with entry #6 is that it does not have enough color. It needs another color along with the black.
Try something new with the font. The symbol can be something TOTALLY different than you've done before. I keep seeing the same thing from everyone else. Would like a fresh take from somebody.