This is just a standard text logo / avatar for right now but which looks better?

1
http://i.imgur.com/QJsFum7.png
Or 2
http://i.imgur.com/mxsIE6b.png
Or 3
http://i.imgur.com/6KhlRwQ.png
Or 4
http://i.imgur.com/m9wPDii.png
Or 5
http://i.imgur.com/gVVKW88.png
Or 6
http://i.imgur.com/lN7O2JK.png

Please vote 1-6 one with most votes after 24 hours of this post wins