Depends largely on who I think has a shot. Also may be influenced by a re-evaluation.
In a worst case scenario, McCain and the Huckster would be in a two person race with everyone else dropped out. So I would probably choose between them if I could generate sufficient preference within myself to make a choice. Both are better then any of the Democrats (though that's not saying much). And it could be if I looked closely I could find reason to favor one over the other.
On the other if a better candidate had even an outside chance, I might go for them. Depends on how much chance, and how much better.
I'm not going to "marry" my vote to any particular candidate ahead of time. I will cast my vote for what I perceive to be the best viable candidate given whatever pleasant or whatever dire choices I am left with. No matter who it is, I will dislike at least something about them, and like at least something about them.
Voting is about serving your nation, not stroking your ego.