Thanks for your entries, kps! It looks like you have taken my recent comments into account, and I appreciate that. Of these, I think I prefer the icon used in #77 and 78 because it is the clearer message. #79 and 80 give a nice visual, but I don't know that it will work with our industry.
I should also mention that I really like the spacing you've brought in with #79...how would that look with the logo from #77/78, and with "INC." at the end?