I think Reddick would be an upgrade on Danny Green. He was the man at Duke, so he is used to defenses adjusting to him and will take the big shots during games (unlike Danny who shrunk as usual).
I like Jefferson too, but I think he will command a lot more than we can afford. I'd say pick up a Phoenix big like Gortat or Scola. They want out of that losing situation and are within our budget.