I'm torn between two chocies. The first is Deadpool, and before you guys go off about how weak he is when compared to other choices (Superman, Lobo, GL, Flash, etc...), generally I don't the problem of super-powered menaces trying to tear me apart. Given that I think Deadpool would be an awesome choice b/c he would consistantly amuse me. Every time I read one of his comics I laugh, I don't see why it would be any different were he my body guard.
My second choice would be Ironman, b/c he's the man....duh