Well, Fred Thompson is currently a visiting fellow at the American Enterprise Institute. That indicates to me that he understands classical economics, something a big government protectionist like Hunter does not. Thompson is also on the record defending social conservatism, and understands the war on terror.
In short, Thompson is probably as closest to Reagan as we're going to get. I'm skeptical if Thompson can do the mechanics-- fundraising, building the ground team, winning the debates, building political friendships, handling 24/7 attacks from the Clinton War Room and their allies in the War Room. But I'm open-minded and may be surprised.
Giuliani's still my guy for the time being-- he reminds the public of 911, makes a convincing argument to fight the WOT in understandable terms, and will have the widest margin of victory, which will help up take back the Congress. Whether Rudy can make it out of the primaries once the NARAL and anti-gun stuff hits the airwaves remains to be seen.