I like #18. It's more of a departure from the AB Solutions logo than what we think we are aiming for, but if we do decide to go for a departure this one will remain out there for condideration. 16 & 17 are too much like something for a security services company.
Yes, we see the repitition of your idea. Moving your earlier submissions with the less bright red out of the rankings in favor of the newer ones with the brighter red - still like the look, just don't want to see the duplicates. :)