It seems to me that it is McCain's nomination to lose. People want someone that they recognize, and his philosophy will be a little more compatible than that of Giuliani. I don't think any of the others are much more than asterisks at this time. McCain though could be another 1996 Dole instead of a 1980 Reagan! Already Trent Lott is said to be for McCain.
McCain has been building his machine for this election for at least three years... using a lot of Bush people from what I've read. I don't like McCain and I don't trust McCain... personally I think he has a screw loose.