The floor will be set by the exclusive franchise tag, which based on current numbers could be in excess of $20 million for 2013. Really, theres no way at this point that the Ravens can use the $14.6 million non-exclusive tag, because plenty of teams would gladly give two first-round picks for a reigning Super Bowl MVP who is still on the front end of his prime.
The Bills, Jets, Browns, Jaguars, Titans, Chiefs, Raiders, Eagles, Vikings, Buccaneers, and Cardinals would all be likely to consider making a run at Flacco. Other teams with entrenched starters would be tempted to at least evaluate the possibility.
If your team gave up two #1s for Flacco, would you be happy? If the Ravens got two #1s for him, would Ravens fans be mad he left?