Republicans, who do you think will have the best chance to beat Obama in 2012?

I want to get an idea of who you honestly think will beat Obama in 2012. Now y'all have a great chance to beat him if y'all would pick the right candidate. I personally say that Paul Ryan would be a good pick along with Scott Brown and Lindsey Graham. They all actually have ideas and are able to articulate them. If y'all choose someone like Ron Paul, Palin, Boehner, or even Romney to go up against Obama, I personally think yall would be basically giving him the nomination. So who do yall think is the best candidate?