Truly a dilemma that even I would consider.
"Nightmare for the 2008 Presidential election: Hillary Clinton versus John McCain. I wouldn't know whether to vote Libertarian or move to Australia."
I would vote for Hillary. I figure her VP choice is probably going to be better than her and I give Hillary three months in office before someone a lot saner than those voting for her takes her out.
McCain has one thing to show me. The Alito nomination.