I like them all but the AT symbol works for me the best along with your name. Adding location to a mark is very traditional and seems to be done just as much as not so it's cool as long as you like it.
Marko, I feel your pain here, designing a mark is one of the hardest things I've ever done. Took me months of toiling and being made fun of by a special friend before I said screw it and just picked something. What a relief to be past that.