"Mr Ed, are there other countries that are in non-compliance with UN resolutions and should they be next on our cross-hairs?"
If you're talking about the U.S.'s crosshairs, I think one has to consider the degree to which the other countries you speak of are a threat to the U.S., as well as the need to not spread our military too thin.
Do you have any doubt that a nuclear Iraq would be a threat to the U.S.?