At this point, unless Paul wins, it looks like voting for Johnson, who is running as a Libertarian.
As far as politics goes, he's pretty close to Paul, except not quite as crazy. He's also had a governorship under his belt, so he's got better experience, IMO.
No way in hell I'm voting for Obama Light. At least if Obama wins, the Republicans will spend the next four years being as obstructionist as possible. I doubt that will be the case if Romney wins.