That is a false premise on several levels, primarily because the nomination of Giuliani is a guaranteed general-election loser in any case, and would kill everything that matters within the GOP.
That said, I'd take Hunter, Brownback, or Huckabee over Giuliani, McCain, or Romney.
And Mike Pence over any of the above. And Thune should declare too.
I can accept any of your candidates and will suopport them if nominated. Good luck.