Center depth needs to be addressed, but I wouldn't make a big splash-y mid-season trade to acquire a center unless that center has All-Star potential. Instead, I think the Celtics should go for a more modest aim of looking for a center who deserves to be in the NBA and can be a fringe rotational player for a contender, but who isn't good enough to start anywhere.
I believe that Bradley and Moore are at a level where the Celtics don't need Dooling. So, Dooling, as an expiring contract making more than the minimum, is the best contract to move for a role player.
Given how much Dooling makes, the Celtics can take back about $2.9 million. Combining Dooling with Marquis Daniels, the Celtics could take back $3.98 million.
By tossing in cash and a second rounder (or two), the Celtics could allow another team to acquire trade assets, even if just for a second round pick or two. (And I think Dooling could be flipped for another low-level asset to a team that suffered a guard injury just before the trade deadline.)
The model for the trade is OKC sending Morris Peterson and DJ White for Nazr Mohammed, except the Celtics probably won't find a center as good as Mohammed. You might get a career backup on the level of Ryan Hollins, but the Cavs don't really need another guard. You could probably get Johan Petro if you're willing to pay him next season. Is Anthony Tolliver really a center, as he is listed on basketball-reference.com?
So, is there a backup center that the Celtics can target?