I always do the buttons up on my collars (if they have them, though I tend to prefer them without) - the open buttonholes just look like I've missed a step when getting dressed.

And I have to say that I like "look 2" much better than the others - something about it just seems right.

Also, since this chain seems like it will continue for a good long while, how about an "ABF Tie Chain" gallery thread that shows each member of the chain wearing their new tie?