I like where u r going with the AMP font in #3 and would like to try some variations on it:
1. I do like how the A is open without the cross portion of the A -- makes the word AMP more recognizable as out specific logo. However would also like to try some more versions with using the cross section of the A as a style element. For example
a version just like u have except make a cross section for the A using a green dot followed by gray line going to the left. the A with using