You look very concerned about something in the fourth one.
I second that. And Micah was right, the smiling one isn't nearly so good as the serious ones. The way to avoid the dead-eye look is to stop smiling between, and to have the photographer or someone talk to you about something pleasant so that you forget you're getting your picture taken. I have to have people stop smiling all the time when I'm doing engagement shots, etc., because it ends up looking fake.
I'd actually vote for #1, because it's a little closer and just enough off-center to give the photo a little dynamic movement or whatever you might call it. Either that or I'd crop #5 in just a bit to be at the same dimensions as #1, because the expression is a little better in that one. I also like the turn of your head in #5, just slightly more than #1. So maybe I'm really voting for #5--I'm convincing myself as I talk about it.
And by the way--looking good! These are much better pictures than the one on your staff page. I don't remember seeing you without glasses.