Ron Paul has stronger pros than anyone else, but I don't like how isolationist he seems to be. Abolishing the Federal Reserve and the IRS are great, but totally pulling out of the UN is a horrible idea. There's a fine line between realizing there are a lot of corrupt government istitutions that need to be cleaned up and being a New World Order conspiracy theorist, and I'm not really sure what side of that line Ron Paul is on now. He's still better than anyone else but John McCain by a million times.
The main Democrats(Clinton, Obama, Edwards, Gore) are all fucking terrible except Obama, who has too little experience.