Agreed. This is no time to nominate a "moderate." Keep our eyes on the prize. Getting more rock-ribbed conservatives on the Supreme Court is vital. Stay consistent: No Moderates!.
Rudy Guiliani has my endorsement for President in '08 if he takes the No Moderates pledge. He can win the election. Folks say he's not far enough to the right to win the nomination, but let him sign The Pledge and we will see.
You're right that the President should nominate a Constitutionalist conservative. But he needs to nominate a Constitutionalist conservative who has no paper trail on controversial issues.