Now and future:
Freeman>Simmons>Heyward
Even though J-Hey is the most talented of the bunch by far, I don't see him accepting a hometown discount, and that is part of the reason I am "ok" with letting him go. He is too inconsistent of a hitter for us to throw close to, if not over 100 million dollars at. Spend the money you would on Heyward and spend it on Justin Upton. He's likely the much better player offensive player over the next 5-10 yrs anyways. I would say it's next to impossible to keep both of them long term.
Freeman, I think, is going to one of those players who will get consistently underrated by most people around baseball due to his lack of power. I think we'll keep him around for awhile due to this.
Simmons is a player you don't try to extend for awhile. Lite hitting defensive specialists typically do not require much to attain. I think Simmons develops into a decent hitter, but not enough to make him a marquee player. We can wait on him for a 3-4 yrs before we have to worry about resigning him. Hopefully keep him around for something similar to what Bourn got this past off-season
I think we should be more worried about extending Minor or Teheran than anyone else honestly.