McCain's VP?

So, there's a lot of talk lately about who McCain should pick as his running mate if and presumably when he earns the nomination. I highly doubt he'd choose a socially-moderate-to-liberal like Romney, but more likely candidates have been brought up, including my Governor, Charlie Crist (not a big fan of his, myself) and others. Rest assured, even if McSame picked Ron Paul himself, you'd have a hard time convincing me to vote for him, but I'm just curious - who do you think he should choose?