Second is too overweight with useless details, third one is ugly and old (it would be ok in 2006)
Main thing in logos is to look the same good as in big and small sizes, on paper, in bw, drawn with pen etc. And 1 font is good, two is doubtable but ok, three is definitely definitely no. I vote for 1.
BTW: can you teach me, how to attach pictures as pictures and not links?
UPD: sorry, I haven't seen that you got a winner
![Undecided](https://bitcointalk.org/Smileys/default/undecided.gif)