Taking Ptyrell at his word would mean my vote for Doomsday would be wasted, as he'd die anyway. I'd want the veteran dead (if he wasn't already killed and cleaned) to win with the witches and arsonist.
So, I'd vote for whomever might be the veteran that isn't already doused by Ptyrell, as they block the witch/surv win, or I'd vote for the SK, which also blocks the witch/surv win. If Ptyrell lives to see the night, and is telling the truth, it's a witch/surv win with either arsonist or SK joining them for the win.
Loads of ifs BUT LOADS OF FUN. I heart chaos.
@Ricer13, who would be getting your vote now?