Given that we have signed KG, and assuming that we sign Ray and Jeff Green, I'm not sure we are going to get a better FA center than if we just re-sign those to which we have rights: i.e.: Krstic.
For a center, he'd be a bargain if we could get him at $5M a year. If the Cs bring him back at a $5M/yr, 3 year deal, I'd be quite happy.
A full offseason/training camp with the Cs would integrate him much better than his initial run with the team.