About the casualty story, I think even if the dead starts pile up, government have no choice but to keep on fighting. If they stop, how can they justify the deaths of American soldiers, let alone the civilian deaths?

North Korea has the added wrinkle of having nukes already, according to CIA. Plus, they have at least 1 million soldiers and better missiles and a population that seems still largely in thrall to their Dear Leader, where as Iraq has 200 hundred thousand troops, and at least the majority Shiites have no love for Saddam. Plus, I don't think South Korea will ever consider offensive action against the North.

Here is a site to satisfy the little war-monger within all of us. Summaries of various country's military.