I like the one with the box, I think you should stick with color on both the upper and bottom half though. I like the one that looks like a crown too, its pretty cool. Unfortunately I don't like the uppercase very much, I think the lowercase font you have chosen in #1, #2, #15, and #16 is a perfect font for what i want, and I love the way it looks in all lowercase, very simplistic, uniform, and professional. You could try toying around with a border around the box, and maybe even bevel the box a tiny bit to give it a sort of 3d feel.
(i'm just throwing ideas out there, shoot down what you will.)
Thanks for the revisions, and keep up the good work!