On another note the Broncos are really taking a big risk on Manning. If he chooses not to go to the Broncos then it is already public that you do not trust in Tebow, which is pretty big blow to his confidence.
Also I hadn't realized but the Cardinals are something like 13 million above the cap. They will have to do a lot of trimming to their roster and restructure contracts, maybe lose around 30 million to sign him. Plus they won't have money for players like Wayne or other free agents to add to their roster.