I think Ainge is targeting a few guys, getting a gage on what it'll take to trade up and figuring out their most likely outcome.
Just going on what I've read and heard (which isn't exactly reliable) I think they like Winslow, Hezejonia, WCS, Johnson and Turner. Those guys are in range, fill positions of need and have pretty strong upside. Depending on how much it would take to get up to where those guys would fall, if they even could, Ainge will only make a decision like that if the cost is less than what he thinks that guy could become.
Turner is probably the most likely of that group available for a "value deal". There's a slight chance he could fall down to us at 16 even. I've heard all good things about his running problem so far, and even though he's a project that needs a few years development, I think this C's team is one of the few in the league that could actually offer him a few decent minutes. His shot-blocking skills is one of the aspects of his game that is NBA ready, and we have such a need there he could certainly get 10mpg if they wanted to go that route. I think in the right situation that kid could become a truly excellent player.