What could you get for him?  He's got to be worth at least a 1st round pick.  Is he worth a Number 1 overall?  Is he worth two 1st rounders?

Peyton Manning is six years older than Ben, so it's not out of the question to think that a team will get at least seven more highly productive seasons out of him, barring major injury.  Brett Favre is twelve years older, but it's probably a bit much to expect Ben to stick around for that long at a high level.

What would it take for you to give Ben up?

EDIT:  I should have remembered to put this in the post originally, but I guess I was having a moment.  Last year, Jay Cutler + a 5th rounder = Kyle Orton, two 1st rounder & a 3rd rounder.