At this point in time, I'm undecided. The only thing I am sure of is that I will not be voting for any one of the Democratic contenders.
At this moment in time, I am leaning towards Rudy Giuliani. While I worry about his electability, and by electability I mean convincing social conservatives to support him, I think he's top notch when it comes to economic and national security issues. Ideally, those are the only two things that should matter; unfortunately, we do not live in a constitutionally ideal society right now, and many people look to the federal government for things that they technically should have no authority to provide, things for which people should instead be looking at their states.
That said, I'm also still open to Fred Thompson and John McCain. Thompson has been a bit of a let-down, but there's still time. He's also solid when it comes to economic and national security issues. McCain is a bit less trustworthy to me when it comes to economic issues.