Larry, from that point of view, he probably won't hurt me. But by that standard, neither would just about any president who promised not to raise taxes. If you throw in constructionist judges (and there is room for improvement over Bush on the lower courts), that is a bonus. But there are still many social areas besides the courts in which I would want a more reliable guy in the office.
Philip, you are correct that Giuliani has the best stripes on national security. I would say he bests McCain in light of McCain's torture resolution. So if national security is your trump issue, then Giuliani is your guy.
As for Romney's flip-flopping, I am not sure what to make of it. For me, it could be sincere. I believe people can change for the better, and I hope this is a case of that. Flip-flopping has a bad rap. If it is strictly for political purposes, it is dishonest and cynical. If it is honest, and for the better, wonderful. Politically speaking, Romney may be able to convince enough pro-lifers that his change is sincere.