Why Austin Rivers? The guy has played 15 games and only 2 in the ACC. He cannot guard quicker guards and is too weak to guard wing forwards. He really only shoots 3's, at least at a level equal to other lottery selection's skills.
I would much rather have the Celtics look into a pure guard like Kidd-Gilcrist or a real forward like Harrison Barnes or Lamb from UConn.
Trust me, stay very far away from Austin Rivers, he will be an NBA bust. Think Jimmer Fredette. There is a reason he is at Duke...and its not the Crazies...