I definitely like #14 best of all your efforts so far. The only thing I dislike is the golden-brown outer circle where the text is. I like the use of text but I would like to see you play with the color of this circle or take it our entirely. That's up to you. The reason why I don't like it is because it is very similar to all the "Guarantee" logos you see. I would like to see the text pop out more please.
Please give us another version of #15 without the brown box around it or at least make the GF emblem pop out a little more. The box seems to dwarf the inner piece.