Which republican Presidential Candidate do we want?

There are two different ways of looking at the possible Republican nominee in 2008. The first is to see who the possible Candidate is that you can most live with. For example in 1992, most Democrats would definitely said that they would rather live with GHWB as opposed to Pat Buchanan.

However, the other possible way is "Which candidate do I think would do worst against a likely Democratic Presidential Nominee?" But that standard Buchanan would have been a much better Republican Nominee for Democrats who wanted to win the presidency (The results of a Dukakis-Buchanan race would be interesting)

Which of the possible Republican Candidates do we as Democrats want as the Republican Nominee in 2008. By this, I'm looking for who would be most likely to lose to a Democratic Candidate of your choice.